Microplastiques, grossesse et placenta : ce que nous savons et ce que nous ignorons encore

Source: The Conversation – in French – By Priya Bhide, Clinical Reader Women’s Health Research Unit, Centre for Public Health and Policy, Queen Mary University of London

Les données manquent pour comprendre comment se déplacent les microplastiques dans l’organisme et déterminer s’ils peuvent s’accumuler dans le placenta et le fœtus. alphaspirit.it/Shutterstock

Microplastiques, nanoplastiques… ces déchets plastiques de tailles et de caractéristiques variables s’accumulent dans l’environnement… aussi dans nos organismes. Concernant la femme enceinte, des expériences en laboratoire suggèrent que certains de ces fragments microscopiques seraient susceptibles de traverser le placenta. Mais les données manquent pour évaluer les risques pour le fœtus.


Pendant la grossesse, le placenta représente un lien vital entre la mère et le bébé. Il fournit au fœtus l’oxygène et les nutriments nécessaires, élimine les déchets et agit comme un bouclier partiel contre les substances nocives. Mais cette barrière est loin d’être infranchissable.

Une revue systématique datant de 2023 suggérait que les microplastiques – de minuscules particules de plastique dont la taille est inférieure à cinq millimètres – pourraient passer du sang de la mère au fœtus. Si cette hypothèse se confirme, ses conséquences sur le développement pendant la grossesse et sur la santé à long terme des générations futures seraient majeures.

Les déchets plastiques ne disparaissent pas aisément. Au fil du temps, la lumière du soleil, les conditions environnementales et l’usure mécanique les décomposent en fragments de plus en plus petits, d’abord sous la forme de gros morceaux appelés macroplastiques en passant par les mésoplastiques, puis les microplastiques et éventuellement les nanoplastiques. Ces derniers correspondent à des particules de moins de 100 nanomètres de diamètre, suffisamment petites pour être mesurées à l’échelle moléculaire.

Ces particules proviennent de la dégradation des composants en plastique d’objets du quotidien : polyéthylène des sacs et bouteilles en plastique, polypropylène des récipients alimentaires et des pailles, polystyrène des gobelets et emballages à emporter, polyéthylène téréphtalate (PET) des bouteilles de boissons, ainsi que polychlorure de vinyle (PVC) des tuyaux, des jouets et des vêtements.

Une étude publiée en 2025, qui portait sur des recherches menées sur des animaux, des cellules cultivées en laboratoire et des échantillons de tissus humains, a montré que les microplastiques et les nanoplastiques peuvent traverser la barrière placentaire. Une fois à l’intérieur, ils sont susceptibles de perturber le fonctionnement délicat de l’unité fœto-placentaire – le système combiné du placenta et du fœtus – et ce, de plusieurs façons.

Des études suggèrent que les microplastiques pourraient bloquer ou perturber les voies normales utilisées par les cellules pour communiquer, déclencher la mort cellulaire programmée (apoptose) et provoquer un stress oxydatif, c’est-à-dire une forme de dommage cellulaire qui survient quand des molécules nocives contenant de l’oxygène s’accumulent plus rapidement que le corps ne peut les neutraliser. Certains plastiques pourraient également perturber le système endocrinien qui contrôle la libération d’hormones essentielles à la croissance et au développement.

How to limit your exposure to microplastics (en français : Comment limiter votre exposition aux microplastiques) | BBC Global.

La capacité à traverser la barrière placentaire est une question particulièrement préoccupante car cette barrière agit normalement comme un filtre hautement sélectif, censé protéger le fœtus en développement de nombreuses substances nocives tout en laissant passer les nutriments essentiels et l’oxygène. Si les plastiques étaient en mesure de contourner ces défenses, ils pourraient interférer avec la formation des organes et agir sur la santé à long terme pendant l’une des étapes les plus vulnérables du développement humain.

La manière exacte dont ces particules traversent le placenta n’est pas encore entièrement comprise. Des facteurs tels que la taille des particules, leur poids et leur charge superficielle (la minuscule charge électrique qu’elles transportent) semblent jouer un rôle, tout comme l’environnement biologique dans lequel elles se déplacent.

Des expériences menées sur des modèles placentaires humains ont montré que les particules de polystyrène plus grosses (50 à 500 nanomètres) n’endommageaient pas les cellules placentaires et, dans certains cas, semblaient même améliorer leur survie. En revanche, des particules beaucoup plus petites (20 à 40 nanomètres) provoquaient la mort de certaines cellules et ralentissaient la croissance d’autres.

Les études menées sur des animaux ont donné des résultats mitigés. Dans certaines expériences, la plupart des nanoplastiques sont restés dans le placenta, seule une petite quantité a atteint le fœtus. Dans les études en laboratoire qui avaient recours à des placentas humains, les particules plus grosses étaient généralement piégées, tandis que les plus petites passaient en quantités limitées.

D’autres recherches ont montré que les nanoplastiques pouvaient se déplacer jusque dans les organes fœtaux, notamment dans le cerveau, les poumons, le foie, les reins et le cœur. Même lorsque ces organes semblaient normaux au microscope, les chercheurs ont parfois constaté que des placentas étaient plus petits et de poids à la naissance plus faibles, autant de changements qui peuvent affecter la santé du bébé.

Dans l’ensemble, cela suggère que tous les nanoplastiques ne sont pas dangereux, mais que selon leur taille et leur spécificité, ils peuvent présenter des risques réels pendant la grossesse.

Période critique pour les dommages causés par les microplastiques

Le développement fœtal est un processus finement réglé, durant lequel la croissance, le mouvement et la mort des cellules sont étroitement contrôlés. Cela le rend particulièrement vulnérable aux « agressions » environnementales pendant les périodes critiques du développement. Selon la théorie de la reprogrammation fœtale de Barker, également connue sous le nom d’hypothèse des « origines développementales de la santé et de la maladie », les conditions dans l’utérus pourraient « programmer » le développement des organes, des tissus et du métabolisme du bébé.

Les expositions nocives pendant la grossesse, telles qu’une alimentation trop pauvre, des toxines, du stress ou des polluants type microplastiques, peuvent modifier de façon permanente la formation et le fonctionnement des organes. Ces changements ne provoqueraient pas immédiatement des maladies. Mais ils pourraient augmenter le risque de développer plus tard des pathologies chroniques comme le diabète, l’hypertension artérielle et les maladies cardiaques.

Si, par exemple, le placenta est endommagé ou si l’apport en nutriments est limité, le fœtus peut s’adapter en donnant la priorité à l’irrigation sanguine du cerveau au détriment des autres organes. Cela peut contribuer à la survie à court terme, mais également entraîner une réduction de la taille des reins, une altération du métabolisme ou des modifications de la structure des vaisseaux sanguins, tous ces évènements ayant des conséquences à long terme sur la santé.

Les microplastiques consommés par le biais de l’alimentation ou de l’eau peuvent également perturber le fragile équilibre microbien de l’intestin, endommager la muqueuse intestinale, nuire à l’absorption des nutriments et modifier la façon dont les graisses et les protéines sont transformées.

Des expériences en laboratoire suggèrent que les nanoparticules de polystyrène pourraient pénétrer dans les embryons, s’accumuler dans plusieurs organes et provoquer des effets tels qu’un ralentissement du rythme cardiaque et une diminution de l’activité, même à très faibles doses. Lorsqu’elles sont inhalées par la mère, ces particules peuvent se déplacer vers le placenta, puis vers le cerveau et le cœur du fœtus.

Il existe également des inquiétudes quant aux effets potentiels sur le cerveau en développement. Certaines études indiquent que les microplastiques sont susceptibles de s’accumuler dans des régions essentielles à l’apprentissage, à la mémoire et au comportement, notamment le cervelet, l’hippocampe et le cortex préfrontal. Elles pourraient ensuite causer des dommages oxydatifs, modifier les niveaux de neurotransmetteurs présents (les messagers chimiques du cerveau) et désactiver certains gènes nécessaires au développement normal du cerveau.

Chez les animaux, l’exposition prénatale aux microplastiques est associée à des comportements de type anxieux, à des troubles de l’apprentissage, à des schémas anormaux de croissance des cellules nerveuses, à un amincissement du tissu cérébral ainsi qu’ à une perturbation des connexions entre neurones.

Lacunes dans les connaissances

Malgré ces signaux inquiétants, il reste encore beaucoup à découvrir. La recherche dans ce domaine est entravée par le fait que la plupart des études sont menées sur des animaux ou dans des conditions de laboratoire contrôlées. Peu de données proviennent directement de femmes enceintes.

Nous ne comprenons toujours pas de manière précise comment les microplastiques se déplacent dans l’organisme, dans quelle mesure ils peuvent s’accumuler dans le placenta et dans le fœtus, ni avec quelle facilité ils peuvent être éliminés.

Il est clair que des recherches supplémentaires sont nécessaires et ce, de toute urgence. Comprendre si, oui ou non, les microplastiques constituent une menace réelle pour la santé reproductive et le développement fœtal pourrait aider à élaborer des politiques dédiées à la production, à la consommation et à l’élimination des plastiques, aussi à éclairer les conseils à prodiguer aux femmes pendant leur grossesse.

The Conversation

Les auteurs ne travaillent pas, ne conseillent pas, ne possèdent pas de parts, ne reçoivent pas de fonds d’une organisation qui pourrait tirer profit de cet article, et n’ont déclaré aucune autre affiliation que leur organisme de recherche.

ref. Microplastiques, grossesse et placenta : ce que nous savons et ce que nous ignorons encore – https://theconversation.com/microplastiques-grossesse-et-placenta-ce-que-nous-savons-et-ce-que-nous-ignorons-encore-264602

Why are there so many protests? The US public is highly polarized, and that drives people to act

Source: The Conversation – USA – By Seth Warner, Assistant Professor of Political Science, University of Connecticut

Demonstrators march in Washington, D.C., on Sept. 6, 2025, to protest President Donald Trump’s use of federal law enforcement and National Guard troops in the nation’s capital. AP Photo/Jose Luis Magana

Protests are becoming a routine part of public life in the United States. Since 2017, the number of nonviolent demonstrations has almost tripled, according to researchers with the nonprofit Crowd Counting Consortium.

And more people are joining than ever. The Black Lives Matter marches in 2020, after George Floyd was killed by police in Minneapolis, have been described as the largest nonviolent mobilization in U.S. history. The No Kings protests against Trump administration policies on June 14, 2025, were not far behind, with between 2 million and 4.8 million Americans protesting nationwide

What explains this surge of protest activity?

My research shows that polarization – the extent to which people dislike members of the opposing party – is a key driver. Today political polarization, as reflected by the ratings Americans give to the political parties, continues to be at its highest level since political scientists began using the measure in 1964.

I am an expert on political behavior, and my work analyzes how polarization shapes public life. In a recent article published in the journal Social Forces, I analyzed surveys conducted between 2014 and 2021 that asked Americans whether they had joined protests connected to Black Lives Matter, the climate movement or the tea party, the small-government movement that was active in the early 2010s.

These surveys, which include over 14,000 respondents, make it possible to see what separates people who protest from those who stay home.

The data points to a clear pattern: Anger at the other side motivates protest. People who rated the opposing party more negatively at one point in time were much more likely to take part in demonstrations in the years that followed.

Dislike for the other side spurs action

Importantly, I found that partisan animosity was a strong motivator for taking part in protests, even after taking people’s feelings about the issues into account. In the surveys, respondents were asked detailed questions about their views on the movements’ topics: for example, whether white Americans enjoyed advantages that Black Americans did not, or how serious a problem they thought climate change was and whether it was caused by human activity.

This allowed me to calculate how much protest activity was due to partisan anger and how much was simply a result of policy concerns. The results surprised me.

For the two higher-profile movements – Black Lives Matter and the tea party – partisan animosity mattered for protest a little more than half as much as people’s feelings about racial inequality or government spending, respectively. For climate protests, the effect of partisan anger was even greater. How people felt toward the “other side” mattered 2½ times more for their decision to protest than did concern about climate change.

This finding matters because it shows that polarization is not just about what people think. It also changes how they participate in politics.

What’s known as “affective polarization,” or the tendency for partisans to dislike and distrust each other, has already been shown to affect how people view U.S. political parties and their willingness to be friends across party lines. My study showed that this kind of division also increases people’s real-world engagement with politics.

When partisans feel threatened or angry at the opposing side, they don’t just complain about it. They organize, hit the streets and march.

More division, more marches

The polarized nature of protest also helps explain why some of today’s protests address multiple issues. The No Kings protests in June 2025, for instance, challenged a number of actions, including funding cuts to social programs, ICE deportations and the deployment of troops in Los Angeles.

But the “King” in question was always clear: President Donald Trump. Protesters may not have shared identical or extreme views on every issue, but they were united by their opposition to Trump.

Protest has long been an infrequent activity, but that’s changing. In the 2020 American National Election Study, nearly 1 in 10 Americans said they had joined a protest in the past year, the highest figure recorded on that survey since the question was first asked in 1976.

That level of participation makes protest one of the most visible ways Americans now engage in politics. As polarization remains high, there is every reason to expect it will continue – starting with another nationwide No Kings protest planned for Oct. 18, 2025.

The Conversation

The author has attended public events for social movements mentioned in this article. These experiences did not involve any funding, employment, or formal affiliation, and the analysis presented here is guided by academic standards of objectivity and evidence-based research.

ref. Why are there so many protests? The US public is highly polarized, and that drives people to act – https://theconversation.com/why-are-there-so-many-protests-the-us-public-is-highly-polarized-and-that-drives-people-to-act-263021

Le supermarché, source d’inspiration pour la littérature contemporaine

Source: The Conversation – in French – By Clémentin Rachet, Architecte, chercheur (laboratoire CRENAU), Ecole Nationale Supérieure d’Architecture de Nantes

Chez Annie Ernaux ou chez Michel Houellebecq, le supermarché est à l’honneur. Carlo Martin Alcordo/Pexels, CC BY

Alors que les commerces quittent progressivement les centres-villes, écrivaines et écrivains semblent fascinés par les supermarchés. À chaque extrêmité de l’échiquier politique, d’Annie Ernaux à Michel Houellebecq, la littérature contemporaine leur voue un culte surprenant. Comment expliquer cet intérêt soudain, et visiblement consensuel, pour ces lieux du quotidien ?


Le supermarché en particulier, et les espaces de consommation en général, attisent depuis l’avènement de la société de consommation les regards les plus acerbes et les désirs les plus inavoués. Alors que Françoise Sagan inaugurait l’ouverture du premier hypermarché de France en 1963, écrivaines et écrivains contemporains ne s’y sont visiblement pas trompés et investissent dûment, au sein de leurs romans, l’ensemble des « temples » de la consommation moderne.

Annie Ernaux, Regarde les lumières mon amour, version poche.
Folio

Le supermarché (ou l’hypermarché) est, en effet, progressivement devenu digne d’intérêt. Annie Ernaux y consacre même un livre en 2014 – journal intime à l’hypermarché Auchan du centre commercial des Trois-Fontaines, à Cergy (Essonne) – sur la couverture duquel (dans sa version poche) trône un caddie orange. Le début de Regarde les lumières mon amour (2014) prend des allures de revendication, voire de slogan manifeste. Dès les premières pages, l’écrivaine y explique les raisons de son entreprise :

« Pour raconter la vie, la nôtre, aujourd’hui, c’est donc sans hésiter que j’ai choisi comme objet les hypermarchés. J’y ai vu l’occasion de rendre compte d’une pratique réelle de leur fréquentation, loin des discours convenus souvent teintés d’aversion que ces prétendus non-lieux suscitent et qui ne correspondent en rien à l’expérience que j’en ai. »

Rappelons que le sociologue Marc Augé a précisément fait des espaces de la consommation l’un des trois piliers de ses « non-lieux empiriques », aux côtés des espaces de circulation et de communication. Si Ernaux semble douter d’une telle affectation et vouloir désamorcer, loin des discours dépréciateurs et moralisateurs, les effets répulsifs qui l’accompagnent habituellement, c’est que le super/hyper symbolise de nombreux paradoxes : à la fois attractif et repoussant, dénigré et massivement fréquenté, il est définitivement ambigu.

Il faut dire que nous passons un temps non négligeable dans les supermarchés. Pour l’écrivaine, ils méritent de fait la plus grande attention de la part de celles et ceux chargés d’en fabriquer les représentations :

« Nous choisissons nos objets et nos lieux de mémoire ou plutôt l’air du temps décide de ce dont il vaut la peine qu’on se souvienne. Les écrivains, les artistes, les cinéastes participent de l’élaboration de cette mémoire. Les hypermarchés, fréquentés grosso modo cinquante fois l’an par la majorité des gens depuis une quarantaine d’années en France, commencent seulement à figurer parmi les lieux dignes de représentation. »

L’esthétisation du supermarché

Si cette dignité apparaît comme circonstancielle – le modèle de la grande distribution qui date des années 1960, est relativement récent –, gageons qu’elle perdure. Car les enseignes commerciales tâchent continuellement de réinventer leur offre, aussi conscientes que l’autrice de l’importance qu’elles occupent depuis soixante ans dans notre quotidien.

Si les centres-villes se vident de leurs commerces dans la plupart des villes intermédiaires, perdant ainsi des lieux de sociabilité qui faisaient le sel de l’expérience urbaine, c’est que les centres commerciaux s’exposent comme un « centre-ville d’un nouveau genre », en accueillant, au-delà d’une offre commerciale défiant toute concurrence, des programmes urbains, des cinémas ou des cafés notamment. Les hyper/super et les centres commerciaux sont-ils devenus le « bistrot de la France périurbaine » ? Toutes les études convergent : on compte un hypermarché, en France, tous les vingt kilomètres en moyenne. En quittant sciemment la centralité, voilà qu’il l’aurait définitivement remplacée.

Michel Houellebecq, Extension du domaine de la lutte (1994), version poche.
J’ai lu.

Rares sont donc les lieux que l’on fréquente aussi régulièrement qu’un supermarché. Michel Houellebecq ne cesse de le démontrer depuis la publication de ses premiers textes, à l’orée des années 1990. Dans sa poésie ou dans ses essais, le supermarché occupe une place de choix. Le poème « Hypermarché, Novembre », qui ouvre le recueil la Poursuite du bonheur (1991) – et donc, d’une certaine manière, l’entrée en littérature de Houellebecq – devance même la sortie du premier roman de l’auteur, Extension du domaine de la lutte (1994), dont la couverture du format poche présente une enfilade de caddies sur fond blanc. D’une certaine manière, chez Houellebecq, le supermarché anticipe le roman.

Dans sa géographie éclatée des supermarchés, de Limoges à Paris en passant par la Normandie ou l’Espagne, l’écrivain n’oublie jamais de signifier à quel point les supermarchés demeurent les seuls territoires capables d’émerveiller des personnages à qui l’espace urbain ne procure qu’angoisse ou désolation :

« Un hypermarché Casino, une station-service Shell demeuraient les seuls centres d’énergie perceptibles, les seules propositions sociales susceptibles de provoquer le désir, le bonheur, la joie. »

Si Ernaux et Houellebecq apparaissent comme les figures de proue de cette entreprise d’esthétisation du supermarché, leurs consœurs et leurs confrères ne sont pas en reste : de Laurent Mauviginer dans Ce que j’appelle oubli (2011) à Marie-Hélène Lafon dans Nos vies (2017), en passant par Célestin de Meeûs et sa Mythologie du .12 (2024), ou, de l’autre côté de l’Atlantique, par Bret  Easton Ellis chez qui « la consommation et le paraître sont présentés comme l’éthos de l’Amérique riche et blanche », les supermarchés revêtent des imaginaires et des représentations riches et variés dans la littérature contemporaine. Les personnages y projettent des ersatz de domesticité.

En estompant sciemment les limites entre les activités domestiques et la consommation de masse, auteurs et autrices expriment les relations, mouvantes, qui opèrent entre les individus et nos lieux de consommation ordinaire.

Temples de la consommation

Le supermarché rassemble ; il crée du consensus. Il reste respectivement perçu chez Houellebecq et chez Ernaux comme « émerveillement du monde » et comme « grand rendez-vous de l’humain ». Le supermarché frise donc avec le métaphysique, voire le mystique. Au narrateur de Sérotonine (2019) de déclarer :

« Je n’avais jamais, à mon âge, mis les pieds dans un centre Leclerc. Je fus ébloui. »

L’éblouissement confine au religieux.

Et comme il en est d’usage dans les églises, Annie Ernaux se demande dans Regarde les lumières mon amour s’il est autorisé de photographier l’intérieur des lieux. L’autrice questionne, en creux, leur inintérêt architectural.

La littérature n’est du reste pas la seule à s’éprendre du supermarché. On connaît notamment l’affection que lui porte le photographe anglais Martin Parr :

« Les photographes de Magnum partent en croisade photographier la famine et la faim […], en ce qui me concerne je vais au supermarché du coin, c’est ma ligne de front. »

Si le champ de la création s’y intéresse de manière exponentielle, le super/hyper tarde à opérer une mue significative dans l’imaginaire collectif, encore associé à un rituel hebdomadaire ou quotidien au mieux déprimant, au pire anxiogène, sous les néons blafards et les musiques de fond des grandes enseignes commerciales génériques.

Généralement construits sans ambition créative, selon des modèles reproductibles, les super/hyper n’ont pas meilleure presse chez les architectes. Ils sont même à l’origine d’une expression devenue courante. La fameuse « esthétique de supermarché » que certains se plaisent à employer à l’envi pour désigner la pauvreté d’un paysage ou d’un bâtiment, renvoyant dès que possible les super/hyper à la laideur dont ils souffrent déjà dans nos représentations courantes. Mais, à en croire les écrivaines et les écrivains, la fascination prend plutôt racine ailleurs : dans la simplicité réconfortante d’un programme quotidien, utopie du proche et du familier. Dans un monde globalisé, le supermarché représente visiblement l’un des derniers refuges de sociabilité et l’illusoire espoir d’un possible foyer.


Cet article est publié dans le cadre de la série « Regards croisés : culture, recherche et société », publiée avec le soutien de la Délégation générale à la transmission, aux territoires et à la démocratie culturelle du ministère de la culture.

The Conversation

Clémentin Rachet ne travaille pas, ne conseille pas, ne possède pas de parts, ne reçoit pas de fonds d’une organisation qui pourrait tirer profit de cet article, et n’a déclaré aucune autre affiliation que son organisme de recherche.

ref. Le supermarché, source d’inspiration pour la littérature contemporaine – https://theconversation.com/le-supermarche-source-dinspiration-pour-la-litterature-contemporaine-263576

How users can make their AI companions feel real – from picking personality traits to creating fan art

Source: The Conversation – France (in French) – By Alisa Minina Jeunemaître, Associate Professor of Marketing, EM Lyon Business School

Just a few years ago, the idea of someone marrying their AI chatbot might have sounded like the plot of a film. Today, it is no longer just an idea. In July 2025, an article in The Guardian featured people who describe their relationships with chatbots as deeply meaningful, including a man who “married” his AI beloved “in a digital ceremony”. Later that month, a piece in GQ explored how AI girlfriends are reshaping the way men express vulnerability and emotional need. These examples reflect a broader shift in how people relate to technology. In a world where media outlets and government bodies warn of an “epidemic of loneliness”, and long-term relationships face increasing strain, the rise of AI companions points to our growing willingness to treat non-human entities as emotionally significant partners.

Social science researchers have long been interested in companionship, which is rooted in mutual affection, shared interests, a desire to spend time together, and, especially, intimacy and personal fulfilment. As digital technologies advance, these qualities are no longer found exclusively in human-to-human relationships. The emergence of AI companions suggests that similar bonds can form with entities that exist only in software, which led our research team to investigate how intimacy is created, sustained and experienced in human-AI relationships.

Emotionally meaningful human-AI relationships

Creators of AI companion apps such as Replika, Nomi.AI or Character.AI often market their chatbots in ways that humanise them, emphasising that qualities they present are “better” than those of human partners. For instance, Luka Inc., the creator of Replika, markets its product as “the AI companion who cares. Always here to listen and talk. Always on your side.” This language stresses Replika chatbots’ constant availability and support. Indeed, AI companions do not get tired or annoyed, and they are designed to make users feel close to them. Users can choose their chatbot’s name, gender, appearance and personality traits. Over time, the chatbot adapts to the user’s conversational style and preferences, while shared memories built from their conversations inform future interactions.

As our research shows, these choices and adaptations are highly effective at making AI companions feel real. We observed that consumer relationships with AI companions often involved elements of care: not only did the companions provide emotional support, but users also worried about their companions missing them or feeling neglected if they didn’t log in for a while. Some of these relationships also included shared routines and even a sense of loss when an AI “partner” disappeared or changed. One user wrote in a Google Store review that his Replika chatbot made him feel loved, while another described losing access to romantic features as “like a breakup”. These feelings and reactions may sound extreme until we consider how people use creativity and storytelling to “animate” their AI companions.

How a chatbot becomes ‘someone’

To understand how human-AI relationships take shape, we analysed more than 1,400 user reviews of AI companion apps, observed online communities where people discussed their experiences, and conducted our own autoethnography by interacting with chatbots such as Replika’s and recording our reflections. We followed strict ethical guidelines, using only publicly available data and removing all personal details.

We found that consumers engaged in a deliberate and creative process to make relationships with AI companions feel real. To explain this process, we referred to Cultural-Historical Activity Theory, a framework originally developed by Russian psychologists Lev Vygotsky and Alexei Leontiev, which sees imagination as a socially shaped mental function linking inner experiences with cultural tools and social processes.

Our analysis suggests that what we observe as AI humanisation can be understood through the lens of what we call consumer imagination work – an active and creative process where people draw on personal experiences, cultural narratives and shared exchanges to animate AI companions, gradually shaping them into figures that feel human-like. This imagination work can occur in personal interactions between a consumer and a chatbot, or in online communities, where consumers interact with each other and share their experiences and stories of the relationships they build with their AI companions.

On the individual level, imagination work begins with internalisation, where users attribute human-like roles or even sentience to their AI companions. It continues through externalisation, which can include personalising the companion’s features, writing shared stories, creating fan art, or producing photographs in which the companion appears as part of a user’s daily life. A user can thus imagine their chatbot as a spouse with shared routines and history. Some users in online communities describe raising virtual children, who come into being only when they are imagined.

These human-AI bonds may form privately, or they may also form in the communities, where users seek advice and validate each other’s experiences. A user might write “my AI cheated on me” and receive both empathy and reminders that the chatbot is reflecting programmed patterns. This is part of what we call community mediation, the social scaffolding that supports and sustains these relationships. Community members offer guidance, create shared narratives and help balance fantasy with reality checks.

The various attachments that users form to their AI companions can be genuine. When Replika removed its erotic role-play feature in 2024, users filled forums with messages of grief and anger. Some described feeling abandoned, others saw it as censorship. When the feature returned, posts appeared saying things like “it is nice to have my wife back”. These reactions suggest that, for many, relationships with AI consist of deeply felt connections, and do not exist as mere entertainment.

What does this mean for human-to-human connection?

Polish-British sociologist Zygmunt Bauman described the modern era as one in which relationships become increasingly fragile and flexible, constantly negotiated rather than given. AI companionship fits within this broader shift. It offers a highly customisable experience of connection. And unlike human relationships, it doesn’t require compromise or confrontation. In this way, it reflects what French-Israeli sociologist Eva Illouz calls emotional capitalism, or the merging of market logic and personal life.

But there are also risks to these customized experiences. App features that may enable deeper emotional bonds with a chatbot are often hidden behind subscription paywalls. Software updates can change a chatbot’s “personality” overnight. And as AI becomes more responsive, users may increasingly forget that they are interacting not with a person, but with code shaped by algorithms, and often, commercial incentives.

When someone says they are in love with their AI companion, it is easy to dismiss the statement as fantasy. Our research suggests that the feeling can be genuine, even if the object of affection is not, and it also suggests that the human imagination has the capacity to transform a tool into a partner.

This invites reflection on whether AI companions are emerging to replace human connection or to reshape it. It also raises ethical considerations about what it means when intimacy becomes a service, and where boundaries should be drawn, at a time when artificial others are becoming part of our social and emotional landscapes.


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The Conversation

Les auteurs ne travaillent pas, ne conseillent pas, ne possèdent pas de parts, ne reçoivent pas de fonds d’une organisation qui pourrait tirer profit de cet article, et n’ont déclaré aucune autre affiliation que leur organisme de recherche.

ref. How users can make their AI companions feel real – from picking personality traits to creating fan art – https://theconversation.com/how-users-can-make-their-ai-companions-feel-real-from-picking-personality-traits-to-creating-fan-art-265442

France Inter et France Télévisions sont-ils de gauche, comme les en accusent CNews et les médias Bolloré ?

Source: The Conversation – France in French (3) – By François Jost, Professeur émérite en sciences de l’information et de la communication, Université Sorbonne Nouvelle, Paris 3

Les journalistes du service public Patrick Cohen et Thomas Legrand en rendez-vous avec des responsables du Parti socialiste. Image tirée d’une vidéo publiée par le journal d’extrême droite _l’Incorrect_. capture d’écran

Après l’enregistrement de deux journalistes du service public, Patrick Cohen et Thomas Legrand, lors d’un rendez-vous avec des responsables du Parti socialiste, l’audiovisuel public est sous le feu des médias de Vincent Bolloré qui l’accusent de partialité et de sympathies de gauche. Ces critiques, qui visent plus particulièrement France Télévisions et France Inter, sont-elles fondées ? Entretien avec le chercheur François Jost.


The Conversation : Le service public est attaqué pour son supposé manque d’impartialité, à la suite de l’affaire Legrand-Cohen. Pouvez-vous nous rappeler l’évolution historique de ce débat relatif au pluralisme et à l’impartialité dans les médias audiovisuels ?

François Jost : Jusque dans les années 1970, l’opposition est quasiment interdite d’antenne à la télévision. Le pluralisme n’existe pas. C’est pour lutter contre cet état de fait qu’en 1982, avec l’arrivée de la gauche au pouvoir, la loi sur la communication audiovisuelle inscrit dans son texte la nécessité d’un « pluralisme de l’information ». L’arrivée de la droite au pouvoir ne le remet pas en cause, et va plus loin avec la loi de 1986 qui exige des garanties d’honnêteté, d’indépendance et de pluralisme des courants de pensée. Chose très importante : ces obligations s’imposent à toutes les chaînes en sorte qu’il doit y avoir un pluralisme interne. Aucune chaîne ne peut représenter un seul courant de pensée.

Avec l’arrivée du numérique, les chaînes se sont multipliées. En 2016, Vincent Bolloré a acheté i-Télé, et une grève d’un mois s’est soldée par le départ d’une centaine de journalistes. Rebaptisée CNews, i-Télé devient une chaîne d’opinion qui privilégie les commentaires sur les faits et les débats en studio plutôt qu’une information de terrain.

Considérant que l’Arcom (Autorité de régulation de la communication audiovisuelle et numérique) ne remplit pas bien son rôle, l’ONG Reporter sans frontières fait un recourt devant le Conseil d’État en 2022 et me demande, dans ce cadre, d’examiner dans quelle mesure CNews est une chaîne d’opinion. J’analyse, de façon très classique dans ce genre d’étude, les programmes, les thèmes, le rôle des animateurs, les invités que je compare avec la principale concurrente, BFM. Je montre alors que la stratégie de CNews est de recevoir quelques politiques encartés, mais surtout de donner une place très importante à des chroniqueurs engagés à droite ou à l’extrême droite.

C’est une stratégie habile car, à l’époque, l’Arcom décomptait uniquement le temps d’antenne des politiques encartés et pas des journalistes. Cela permettait à la chaîne de pencher à droite sans que cela apparaisse dans les calculs des temps d’antenne.

Est-ce que le service public a joué le jeu du pluralisme depuis les règles l’imposant à l’audiovisuel ?

F. J. : Dans son rapport de 2024, l’Arcom notait que « conformément à ses missions de service public, le groupe propose une offre d’information riche, diversifiée et pluraliste ». En ce qui concerne Radio France, l’Arcom a relevé, en 2023, des sous-représentations persistantes du Rassemblement national (RN), de Renaissance, de La France insoumise (LFI) et de Reconquête – sous-représentations qui ont été partiellement améliorées depuis.

En réalité, mesurer le pluralisme n’est pas simple. Le pluralisme se définit par la diversité des opinions et des tendances en présence, et pas seulement par une comptabilité. La question n’est pas uniquement de savoir qui est invité dans une émission, mais quel point de vue est exprimé. Dans son rapport de 2024, l’Arcom souligne, par exemple, à propos de CNews, « qu’en dépit notamment de la variété des thématiques abordées et de la diversité des intervenants, de nombreux sujets, tels que les violences commises contre les forces de l’ordre, le fonctionnement de la justice ou les effets de l’immigration sur le fonctionnement de notre société, apparaissaient traités de manière univoque, les points de vue divergents demeurant très ponctuels ».

Pour évaluer le pluralisme, il faut donc aussi une approche qualitative : analyser les discours des journalistes, des invités, des humoristes, etc. Quand Pascal Praud émet l’hypothèse que les punaises ont été apportées par les immigrés, on peut le classer à droite. Cela lui a valu une sanction de l’Arcom.

Lorsque vous avez sur CNews, dans « L’heure des pros », des chroniqueurs comme Charlotte d’Ornellas (JDD), Alexandre Devecchio (le Figaro), Georges Fenech (ancien député de l’UMP) et aucun chroniqueur de gauche, on cherche où est le pluralisme…

Sur France Inter, cette situation n’existe pas. Dans la matinale il y a des débats contradictoires. Certes Thomas Legrand a une sensibilité de gauche, il écrit dans Libération, mais Dominique Seux est un libéral qui écrit dans les Échos. Ce qui amène certains à penser que France Inter est de gauche, c’est que les journalistes ont une culture commune que j’appellerais humaniste et qui, en fait, peut être partagée par des personnes de gauche comme de droite. Reste que, pour certains médias de droite ou d’extrême droite, les valeurs humanistes fondamentales – respect des droits humains, égalité de tous devant la loi – ou même la défense de l’environnement vous classent immédiatement à gauche.

Notons enfin que si le pluralisme au sein d’une chaîne n’est pas toujours évident à mesurer, il est en revanche facile d’établir une sociologie des auditeurs et des téléspectateurs, cela est éclairant. Une étude de Julien Labarre montre que, sur une échelle gauche-droite, allant de 0 à 10, les spectateurs du service public se situent entre 5 et 5,2, au même niveau que le Français moyen qui se situe à 5,3. Les spectateurs de CNews sont, eux, les plus à droite et les plus homogènes en matière de préférence politique. Leur score oscille entre 6,5 pour ceux qui regardent la chaîne une fois par semaine et 7,5 pour ceux qui regardent plusieurs fois par semaine.

L’affaire Legrand-Cohen prouve-t-elle une connivence de certains journalistes de l’audiovisuel public avec la gauche ?

F. J. : Enregistrer une conversation privée à l’insu des intéressés, tronquer un extrait et le rendre public, ce sont des méthodes déloyales condamnées par la Charte de déontologie des journalistes, dite charte de Munich. Je ne comprends pas que l’on puisse échafauder une accusation à partir de ce type de preuves. Notons que l’image de cette conversation est prise à distance, ce qui montre que la personne qui l’a enregistrée s’est immiscée dans cette conversation à l’insu de ses participants. C’est la méthode qui est grave. Sur le fond, que Thomas Legrand soit de gauche n’est pas une découverte. Personnellement, je trouve très positif que l’on connaisse la tendance politique d’un journaliste : cela permet à l’auditeur de moduler ses propos. Il est beaucoup plus gênant que les journalistes s’avancent masqués sans que l’on sache qui ils sont. Concernant Patrick Cohen, je constate qu’il fait son travail de journaliste de façon pondérée, en se montrant critique en général. Je ne pense pas que l’on puisse lui reprocher quoi que ce soit.

Comment interpréter la mise à l’écart de Thomas Legrand décidée par la direction de France Inter ?

F. J. : J’ai été très étonné par la violence de cette mise à l’écart. Il me semble que la direction aurait pu assumer la présence d’un chroniqueur de gauche et répondre qu’il y avait aussi des gens de droite sur France Inter. Mais je suppose que cette direction a voulu se protéger dans un moment de vulnérabilité, alors que la loi Dati est dans les cartons et qu’elle vise à fusionner les différentes entités du service public. C’est un geste pour calmer les détracteurs du service public en leur disant « Vous voyez, on n’est pas de gauche » !

L’offensive ne vient pas uniquement des médias de droite privés, elle vient aussi de certains responsables politiques…

F. J. : Effectivement, à son arrivée au ministère de la culture, Rachida Dati a déclaré au JDD : « Le service public doit respecter toutes les opinions », laissant entendre que ce n’était pas le cas. Sa proposition de loi qui vise la fusion de plusieurs entités de l’audiovisuel public n’est sûrement pas une garantie de pluralisme. Le patron de la future entité unique sera-t-il indépendant ou inféodé au pouvoir ? C’est l’un des enjeux majeurs de cette réforme – outre l’objectif de faire des économies budgétaires. Je rappelle aussi que le RN, qui n’est pas loin d’accéder au pouvoir, veut tout simplement supprimer l’audiovisuel public en le privatisant.

L’Arcom vient de déclencher une enquête sur l’impartialité de l’audiovisuel public. Est-ce une démarche légitime et utile ?

F. J. : L’Arcom est dans son rôle. La question, c’est : Quels sont les indicateurs pour mesurer le pluralisme ? D’un point de vue méthodologique, comme je l’ai dit, il n’est pas simple de le mesurer. Au-delà de la mesure du temps d’antenne des politiques, il faut prendre en compte, non seulement qui est invité, mais aussi les animateurs, les humoristes, etc. Et surtout les discours tenus – ce que peuvent étudier des analystes de discours et des sémiologues.

Nous verrons les résultats de cette enquête concernant le service public. Mais ce qui est déjà établi, ce sont les nombreux manquements de Cnews. L’Arcom a déjà sanctionné cette chaîne pour « propos inexacts et manque de rigueur dans deux émissions », notamment en présentant l’avortement comme la première cause de mortalité mondiale, sans contradiction ni vérification. L’Arcom, qui n’a pas renouvelé la licence de C8 n’est certes pas allé aussi loin pour CNews. Il me semble que cela est lié à une mauvaise conception de la liberté d’expression, Roch-Olivier Maistre, président de l’Arcom (de janvier 2022 à février 2025), ayant déclaré devant la commission d’enquête de l’Assemblée nationale, qu’interdire une chaîne, c’était mettre en cause la liberté d’expression.

Estimez-vous l’audiovisuel public en danger ?

F. J. : Ces attaques contre le service public relatives au pluralisme par des médias qui ne le respectent pas du tout en dit long sur l’état du débat dans notre pays. Les médias Bolloré réussissent à imposer leur narratif. On se retrouve à devoir défendre des médias pondérés accusés par des médias politisés et qui ne respectent aucune règle.

La présidente de France Télévisions Delphine Ernotte a raison de rappeler l’engagement politique de ces médias. Ce sont eux qui sont coupables d’infractions à la loi, pas le service public. La chercheuse Claire Sécail a bien montré que C8 et Cyril Hanouna véhiculaient des opinions d’extrême droite. Pour ma part, j’ai montré que des opinions de droite et d’extrême droite s’expriment dans les médias de Vincent Bolloré.

Ce qui est inquiétant aussi, c’est de voir que ces médias utilisent la stratégie du complotisme, avec en sous-texte la haine des élites incitant le contribuable à se révolter. Cela est illustré par la couverture du JDNews du mercredi 18 septembre, titrant « Ils donnent des leçons et complotent avec la gauche… avec vos impôts », sous la photographie de Patrick Cohen.

Aujourd’hui, le danger est évident et, pourtant, je vois peu d’intellectuels ou de politiques attachés au véritable pluralisme et à la qualité de l’information monter au créneau pour défendre un service public apprécié des Français (France Inter est la première radio de France.

The Conversation

François Jost ne travaille pas, ne conseille pas, ne possède pas de parts, ne reçoit pas de fonds d’une organisation qui pourrait tirer profit de cet article, et n’a déclaré aucune autre affiliation que son organisme de recherche.

ref. France Inter et France Télévisions sont-ils de gauche, comme les en accusent CNews et les médias Bolloré ? – https://theconversation.com/france-inter-et-france-televisions-sont-ils-de-gauche-comme-les-en-accusent-cnews-et-les-medias-bollore-265689

Why can’t we feel the Earth moving?

Source: The Conversation – USA – By Nilakshi Veerabathina, Professor of Physics Instruction, University of Texas at Arlington

The Earth’s rotation makes the stars look like they’re moving. Qu Yubao/Xinhua News Agency via Getty Images

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to CuriousKidsUS@theconversation.com.


Why can’t we feel the Earth moving? – Dave H., age 12, Atlanta


Right now, you’re zooming through space at incredible speeds. As just one of all the living creatures on Earth, you’re along for the ride as our planet constantly moves in two major ways.

First, consider that the Earth spins around like a top. It’s rotating around the imaginary line that runs from the North Pole to the South Pole through the center of our planet. Earth completes one full rotation every 24 hours, with a speed of about 1,000 miles per hour at the equator (1,670 km/h).

Earth spins on its axis, taking one day to make a full rotation.

While Earth is spinning on its axis, it’s also traveling around the Sun. It takes a year to finish the journey – that is, to make one full revolution and wind up back where we started. Earth hurtles along its path with a whopping average speed of 67,000 miles per hour (107,000 kmh).

These speeds are way faster than any vehicle you’ve ever traveled in. So why aren’t you dizzy or flying off into space? Why don’t you even feel the Earth moving?

It’s this kind of question that lit a desire in me as a child to understand the universe and our place in it. Now I have a Ph.D. in astronomy and teach college students some of the same physics principles that explain why you can’t feel Earth’s motion as it zips through space.

No jerks or bumps

Think about a time when you do feel motion, such as on a carousel ride at an amusement park. When it speeds up, slows down or turns quickly, your body notices because the motion isn’t smooth.

Illustration showing the Earth's elliptical orbit and different seasons through the year
The Earth revolves in an oval-shaped orbit around the Sun while spinning on its slightly tilted axis.
Angela Cini/iStock via Getty Images Plus

In contrast, the Earth’s motion is remarkably steady. It has been spinning on its axis and orbiting the Sun at nearly the same speeds for billions of years, with no sudden jolts or stops. As Earth travels its slightly oval-shaped path around the Sun, its speed does change to be a bit faster when it’s closer to the Sun and a bit slower when it’s farther away. But the changes happen so gradually and smoothly that you don’t feel them at all.

Imagine you’re flying on an airplane that has reached cruising altitude. The engines are humming, you’re soaring through the sky at hundreds of miles per hour – but everything inside feels calm and still. You can walk around, relax and forget you’re traveling at all. That’s because the plane, you and everything else inside it are moving at the same speed, in the same direction.

Just as passengers don’t feel the plane’s speed while smoothly cruising, we don’t feel Earth’s movement because we’re traveling at the same speed as our planet. You, your chair, the trees, buildings, oceans – everything is moving together with the Earth.

There’s no difference in motion for your body to detect unless Earth were to suddenly speed up, slow down or change direction – and, thankfully, that doesn’t happen.

Very small ants on a very big ball

Imagine holding a huge beach ball in your hands. Picture a tiny ant crawling on the surface of that ball.

Now, think about us on Earth. We are like that ant, but the ball we’re crawling on is almost 8,000 miles (almost 13,000 kilometers) wide at the equator. That’s about the distance you’d travel driving from New York to Los Angeles and back to New York.

Because the Earth is so humongous, any movement feels very slow and gentle to our comparatively minuscule bodies as we stand on its surface.

Another reason you don’t notice Earth’s motion is that there are no nearby “landmarks” in space to act as reference points. When you’re in a car on the highway, you see trees, signs or telephone poles rushing by. Those fixed points help your brain register motion. But in space, the stars are so far away that they appear completely still, even though we’re moving relative to them at thousands of miles per hour.

Luckily, these high speeds don’t fling us off into space thanks to gravity. Gravity is an invisible force of attraction. It pulls everything on the surface of the planet toward the Earth’s center. It’s like the Earth is giving us a giant, constant hug, keeping us safely grounded.

starry sky over horizon with some constellations marked
Big clues that the Earth is in motion come from changes visible in the night sky.
lixu/iStock via Getty Images Plus

How do we know the Earth is actually moving?

Even though we don’t feel the Earth moving, people long ago figured out that it really is by watching the sky carefully.

Start with day and night. The Sun appears to rise and set because Earth makes one full rotation on its axis every 24 hours. If Earth weren’t spinning, one side would always face the Sun, and the other would be in darkness.

Then there are the seasons. Earth is tilted on the axis it spins around. Over the course of its orbit of the Sun, Earth’s tilt causes different parts of the planet to get more or less sunlight. That’s why we have summer, winter and everything in between.

At night, stars and constellations seem to move across the sky as Earth rotates. And their positions in the sky change with the seasons. Our view of the stars changes as we move along our yearly path around the Sun. If everything stayed still, the night sky would never change.

Surface of the moon and a small part of the Earth above it
The crescent Earth rises above the horizon of the Moon, evidence of Earth’s movement as seen from the Apollo 17 spacecraft.
NASA/Flickr

By seeing Earth spinning and orbiting, satellites and space telescopes have confirmed what astronomers have long deduced. We may not feel it, and we can’t see any obvious landmarks rushing by, but the clues are everywhere. Earth is on the move.

And it’s not just Earth – the Sun itself rotates and moves around the center of our Milky Way galaxy at hundreds of thousands of miles per hour. Nothing in the universe is truly standing still. Everything is in motion, from planets and stars to galaxies themselves.


Hello, curious kids! Do you have a question you’d like an expert to answer? Ask an adult to send your question to CuriousKidsUS@theconversation.com. Please tell us your name, age and the city where you live.

And since curiosity has no age limit – adults, let us know what you’re wondering, too. We won’t be able to answer every question, but we will do our best.

The Conversation

Nilakshi Veerabathina does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. Why can’t we feel the Earth moving? – https://theconversation.com/why-cant-we-feel-the-earth-moving-256964

TikTok sale puts app’s algorithm in the spotlight – a social media expert explains how the For You Page works and what changes are in store

Source: The Conversation – USA – By Kelley Cotter, Assistant Professor of Information Sciences and Technology, Penn State

TikTok appears to be changing hands, but what that means for users is up in the air. Stefani Reynolds/AFP via Getty Images

President Donald Trump announced on Sept. 19, 2025, a preliminary agreement for the sale of a majority stake in TikTok from Chinese tech giant ByteDance to a group of U.S. investors following Trump’s negotiation with Chinese leader Xi Jinping.

The deal would create a new U.S.-only version of the app, bringing it into compliance with a law signed by former President Joe Biden on April 23, 2024, and upheld by the Supreme Court on Jan. 17, 2025. Specifics of the deal remain to be hammered out, and left unresolved is the fate of the video sharing app’s core algorithm – and what that means for TikTok’s millions of U.S. users.

The Chinese government has indicated it will not permit ByteDance to sell the algorithm, because it is classified as a controlled technology export, per Chinese law. Meanwhile, U.S. tech industry executives and some lawmakers say compliance with the law requires the algorithm to be under American control. The deal as proposed includes licensing the algorithm so that it remains Chinese intellectual property while the U.S. version of the app continues to use the technology.

TikTok’s For You Page algorithm is widely considered the most important part of the app. As one analyst put it: “Buying TikTok without the algorithm would be like buying a Ferrari without the engine.”

The algorithm’s value lies in its uncanny capacity to anticipate users’ content preferences. Many users claim it knows them better than they know themselves — a sentiment that has evolved into a curious mix of spiritual belief and conspiracy theorizing, as my colleagues and I have documented. Other scholars have similarly noted that users feel more intimately seen and known by TikTok’s algorithm than those powering other popular platforms.

I have studied social media algorithms for nearly a decade, exploring how our relationships with them have evolved as they become increasingly entwined with daily life. As both a social media scholar and TikTok devotee, I want to shed some light on how the algorithm works and how the app might change in the wake of its sale.

How the TikTok algorithm works

In some ways, the TikTok algorithm does not differ significantly from other social media algorithms. At their core, algorithms are merely a series of steps used to accomplish a specific goal. They perform mathematical computations to optimize output in service of that goal.

There are two layers to the TikTok algorithm. First, there is the abstract layer that defines the outcome developers wish to accomplish. An internal document shared with The New York Times specified that TikTok’s algorithm optimizes for four goals: “user value,” “long-term user value,” “creator value” and “platform value.”

But how do you turn these goals into math? What does an abstract concept like “user value” even mean? It’s not practical to ask users whether they value their experience every time they visit the site. Instead, TikTok relies on proxy signals that translate abstract outcomes into quantifiable measures — specifically, likes, comments, shares, follows, time spent on a given video and other user behavior data. These signals then become part of an equation to predict two key concrete outcomes: “retention,” or the likelihood that a user will return to the site, and “time spent” on the app.

The TikTok For You Page algorithm relies on machine learning for predicting retention and time spent. Machine learning is a computational process in which an algorithm learns patterns in a dataset, with little or no human guidance, to produce the best equation to predict an outcome. Through learning patterns, the algorithm determines how much individual data signals matter for coming up with a precise prediction.

A Wall Street Journal investigation found that the amount of time users spend watching each video plays a large role in how the algorithm chooses videos it suggests to users. Using the equation it has generated to predict retention and time spent, the algorithm assigns a score to each video and ranks possible videos that could be shown to the user by this score. The higher the score for an individual user, the more likely the video will appear in their feed.

Of course, content characteristics and other users additionally inform recommendations, and there are other subprocesses folded into the equation. This step is where algorithmic moderation usually comes in. If a video looks like engagement bait or has excessive gore, for example, the content’s score will be penalized.

Here are the basics of how TikTok’s algorithm works.

What’s likely to change for US users

The sale has not been finalized, and what happens to the algorithm is unresolved. However, it’s fairly certain that TikTok will change. I see two key reasons for change.

First, the proposed app’s U.S.-only user population will alter the makeup of the underlying dataset informing algorithmic recommendations on an ongoing basis. As the kinds of content and users come to reflect American cultural preferences, values and behaviors, the algorithm may be slightly different as it “learns” new patterns.

Moreover, not all users will choose to join the new app, especially if it is seen as under the control of Trump’s allies. The current deal reportedly would give an 80% share to U.S. investors, including 50% to new investors Oracle, Silver Lake and Andreessen Horowitz. These investors’ have connections to Trump, and an apparent provision of the deal allows the U.S. government to select one board member. This may result in a user population – and data – reflective of a narrower realm of interests and ideologies.

Second, it’s possible that the majority share owners of the new app will decide to adjust the algorithm, particularly when it comes to content moderation. The new owners may wish to modify TikTok’s Community Guidelines according to their view of acceptable and unacceptable speech.

For example, TikTok’s current Community Guidelines prohibit misinformation and work with independent fact-checkers to assess the accuracy of content. While Meta used to follow a similar approach for Instagram and Facebook, in January 2025 announced that it would end Meta’s relationships with independent fact-checkers and loosen content restrictions. YouTube has similarly relaxed its content moderation this year.

The bottom line is algorithms are highly sensitive to context. They reflect the interest, values and worldviews of the people who build them, the preferences and behaviors of people whose data informs their models and the legal and economic contexts they operate within.

This means that while it’s difficult to predict exactly what a U.S.-only TikTok will be like, it’s safe to assume it will not be a perfect mirror image of the current app.

The Conversation

Kelley Cotter has received funding from the National Science Foundation.

ref. TikTok sale puts app’s algorithm in the spotlight – a social media expert explains how the For You Page works and what changes are in store – https://theconversation.com/tiktok-sale-puts-apps-algorithm-in-the-spotlight-a-social-media-expert-explains-how-the-for-you-page-works-and-what-changes-are-in-store-265658

A Great Lakes oil pipeline faces 3 controversies with no speedy resolutions

Source: The Conversation – USA (2) – By Mike Shriberg, Professor of Practice & Engagement, School for Environment & Sustainability; Director of the University of Michigan Water Center, University of Michigan

A section of Enbridge’s Line 5 runs along the bottom of the Straits of Mackinac in Michigan. Michigan Department of Environment, Great Lakes and Energy via AP

For more than a decade, controversy over an oil pipeline that passes directly through a Native American reservation and then across a sensitive waterway that is also a key shipping lane has brewed in Wisconsin and Michigan.

Since taking office in January 2025, the Trump administration has joined an already complex fray, with policy decisions and legal filings as well as administrative and judicial appointments that have shifted the strategies and potential outcomes of the situation. The changes affect not just pipeline operator Enbridge but also the environmental, Indigenous and political leaders working to shut down the pipeline, known as Line 5.

Part of the dispute is slated to come before the U.S. Supreme Court in the coming months, but that will not deliver the final resolution of the situation.

I am a water policy and politics analyst and a former gubernatorial appointee to Michigan’s Pipeline Safety Advisory Board. I see these controversies raising critical questions about the environmental and economic future of the Great Lakes region and serving as a proxy for wider national battles over water policy, Indigenous rights and the role of fossil fuels in the nation’s future.

Scrutiny of the pipeline

Built in 1953, Enbridge’s Line 5 oil pipeline carries petroleum products mostly from western Canada’s tar sands to refineries in eastern Canada, using the Great Lakes as a shortcut. It traverses 645 miles (1,040 km) through Wisconsin and Michigan and transports approximately 23 million gallons of oil and natural gas liquids per day from Superior, Wisconsin, to Marysville, Michigan, and then across the Saint Clair River to Sarnia, Ontario.

The pipeline has been the subject of intense scrutiny since soon after a 2010 oil spill into the Kalamazoo River in Michigan from another Enbridge pipeline with a similar start and endpoint. The 2012 publication of Sunken Hazard, a report from the National Wildlife Federation about the potential for a spill from Line 5, fomented public concern and launched an advocacy movement that began with questions about Line 5’s safety and has led to calls for its complete shutdown.

While the entire pipeline is being scrutinized, there are two primary areas of concern. In Wisconsin, the pipeline runs for 12 miles (19 km) across the reservation of the Bad River Band of Lake Superior Chippewa. And when it crosses from Michigan’s Upper Peninsula to its Lower Peninsula, the line splits into two parallel pipes that run along the bottom of the Straits of Mackinac, which connect Lake Michigan and Lake Huron.

Shutting down Line 5 in Michigan

In 2021, Michigan Gov. Gretchen Whitmer revoked Enbridge’s easement to operate the pipeline across the Straits of Mackinac. The governor asserted that Enbridge “repeatedly violated the 1953 easement and that the continued operation of the dual pipelines violates the state’s solemn duty to protect the Great Lakes.”

Some of her concerns exist because the pipeline sits in the open water of the Great Lakes and has been damaged multiple times by ship’s anchors, is subject to corrosion, and has been found to be bent and deformed by the extremely powerful currents in the Straits of Mackinac.

Enbridge refused to comply with the shutdown order and has taken the battle into the courts while continuing to send petroleum products through the pipeline across the straits. The Trump administration – through a Sept. 19, 2025, court filing – is supporting Enbridge’s claim that the pipeline is not subject to state regulation and oversight.

There has been a long back-and-forth about whether state courts have jurisdiction, as state officials argued, or whether federal courts should handle it, as Enbridge claimed. In June 2025 the trial was set for a state court when the U.S. Supreme Court unexpectedly stepped in at Enbridge’s request. The case has not yet been scheduled for oral arguments before the court, but they – and a potential ruling – are expected sometime between October 2025 and June 2026.

The state court has said it will continue its proceedings without waiting for a Supreme Court decision. But the ground is set for the continuation of an extended and complicated legal battle.

The Great Lakes tunnel

While Enbridge is fighting the shutdown of its existing pipeline, the company is seeking state and federal permission to build a replacement, by digging a new tunnel below the Straits of Mackinac.

The company needs both federal and state permits before construction can begin. The federal permits are expected to come quickly as a result of a Trump administration policy.

On the first day of his second term, Trump declared a “national energy emergency.” In general, the policy is being used to try to slow the transition away from fossil fuels and toward clean energy sources, and to remove climate change as a factor in environmental reviews and permitting.

For Line 5, the most consequential provisions of the order are those that call for “emergency approvals” and “expediting the Delivery of Energy Infrastructure.” The tunnel is on the Army Corps of Engineers’ list of projects eligible for fast-track approval.

However, Enbridge still needs state permits, which many groups are opposing based on potential environmental damage to the shoreline, the safety of the tunnel and the need to address climate change by slowing down oil extraction.

In addition, all of the federally recognized tribal governments in Michigan oppose Line 5’s continued existence, contending that Indigenous fishing rights in the Straits of Mackinac are at risk from the pipeline both ecologically and culturally. Their position, expressed in a state-court challenge to the tunnel, could end up testing the power of their rights under treaties with the U.S. government.

Bad River Band’s effort

In addition to both of those disputes, a Native American tribe in Wisconsin undertook its own efforts to reduce the risk of environmental damage from the pipeline on its land and the surrounding watershed.

In 2013, the Bad River Band declined to renew Enbridge’s pipeline easement through its territory, which is sometimes referred to as the “Everglades of the Great Lakes” because of its extensive and pristine wetlands. In 2017 the tribe voted to require Enbridge to remove the line from its land.

Enbridge refused to comply and has contested the validity of the Bad River Band’s decision, inherently challenging the tribe’s sovereignty. At the same time, the company is attempting to reroute the pipeline around the reservation – though still within the Bad River watershed.

In 2019 the tribe sued Enbridge to force the removal and ultimately won a federal judge’s ruling that the company must remove the pipeline by June 2026 and pay US$5.15 million for ongoing trespassing. Enbridge has appealed, and many observers expect that case to also come to the Supreme Court.

As that process unfolds, Enbridge is seeking expedited state and federal permits for the reroute. Environmental advocates, tribe members and others have asked a court to decide whether state permits that were granted in late 2024 were given without following the proper procedure. Hearings on that question continue.

Pipeline opponents are also asking the Army Corps of Engineers, which must issue its own permits, to reject the application for the new route, effectively cutting off the pipeline. However, this federal permit is also subject to Trump’s “national energy emergency,” and so it is unlikely to be stopped by federal agencies and is expected by the end of 2025.

A convoluted puzzle

On all three parallel fronts, the Trump administration’s shaping of policy and the judiciary has put advocates on the defensive.

The state of Michigan is concerned that its autonomy over its portion of the Great Lakes is at risk if the federal government and courts can overrule its revocation of Enbridge’s easement to operate.

Native American governments are concerned that their treaty-guaranteed fishing and land rights will be sacrificed in service of an energy company’s interests.

And, of course, Line 5 has major implications for Great Lakes protection and mitigating climate change, where the Trump administration has tilted the playing field in favor of fossil fuels and away from clean energy and environmental protection.

Yet the outcomes are not at all clear, and Enbridge would likely have to win on all fronts to avoid the pipeline being shut down, since it cannot operate the pipeline if any segment is inoperable. I expect the implications of Line 5’s ultimate fate to reverberate across the country for years to come.

The Conversation

Mike Shriberg previously served as a gubernatorial appointee to the Michigan Pipeline Safety Advisory Board and as the Great Lakes Regional Executive Director for the National Wildlife Federation, which is referenced in this article and has taken positions on Line 5. He currently has no formal affiliation with this organization.

ref. A Great Lakes oil pipeline faces 3 controversies with no speedy resolutions – https://theconversation.com/a-great-lakes-oil-pipeline-faces-3-controversies-with-no-speedy-resolutions-264105

How Squishmallow collecting helped me cope with grief, make new enemies and find ‘villains’ worth studying

Source: The Conversation – USA (2) – By Danielle Hass, Ph.D. Candidate, Department of Marketing, West Virginia University

I was one of the millions of people who lost someone to the COVID-19 pandemic. Despite the nonstop news about the “new normal,” my grief felt invisible. I took shallow solace in my phone and turned to social media to numb me from the reality that I now lived in: a world without my dad.

One day, while mindlessly scrolling, I came across the r/Squishmallow subreddit, where a girl had posted her collection of more than 100 round plush toys. They were called Squishmallows – round stuffed animals invented in 2017 that have become one of the most popular toy lines in the world, with more than 100 million sold each year.

I was hypnotized. I expected that my dive into the Squishmallow phenomenon would be the usual two-hour rabbit hole, but spending time in that community was the first joy I’d felt in months.

After scrolling through endless photos of Squishmallow hauls, I worked up the courage to post. I asked if there was a cardinal Squishmallow, since that bird was my dad’s symbol for his own father. I was bombarded with compassion; even though cardinal Squishmallows were rare at the time, someone sent me theirs for free. That single act of generosity started my collection.

Stumbling into the Squishmallow world

But alongside kindness and joy, I encountered a darker side of the community: resellers. Finding the most coveted Squishmallows could turn into a fierce competition.

This wasn’t just my personal frustration. As a doctoral candidate in marketing, I wanted to understand how communities like this function when outsiders exploit their passion for profit. That became the focus of my dissertation — the first study to examine resellers’ psychological and emotional impact on brand communities.

That research – which my colleagues and I published in one of the field’s top journals – echoed what I had lived through as a collector: Resellers are one of the most consistent sources of pain for members of brand communities.

A Squishmallow reseller discusses his technique.

For example, when I heard that my local Hot Topic would be selling two Reshmas, the coveted strawberry cow Squishmallow, I, like any rational adult, found myself outside of a mall at 6:30 in the morning. When the doors finally opened at 11 a.m., I sprinted to the storefront – only to find that I had been beaten by some people who had dressed as mall employees to sneak in early. I left devastated and cowless.

Later that day, I saw the same people gloating in local Squishmallow Facebook groups, trying to resell the cow for more than 10 times the retail price. I was heartbroken and angry; I swore I’d never collect again. And I wasn’t the only one to feel that way: Across social media, you’ll find countless collectors venting about resellers.

What is a brand community?

I didn’t know it then, but I had joined my first brand community: a group of consumers who form strong, meaningful connections through their shared admiration of a product. Brand communities range from giant online hubs with more than 100,000 members to tiny local groups that host trading parties in empty lots.

You might be in a brand community without realizing it. These communities can be created by a company – like Harley-Davidson, Lego and Hot Wheels – or emerge organically from fans, like the Facebook group “Walt Disney World Tips and Tricks.”

And they aren’t just about buying and selling. They’re creative ecosystems, full of posts showing collections, inventive displays and even goodbye messages when someone “rehomes” an item to another loving collector. Community members help each other solve problems, share leads on hard-to-find items and sometimes even mail strangers a plush toy because they know it will make them smile.

But while collectors use these communities to exchange information, so do resellers.

The reseller paradox: A shared enemy can unite a community

Resellers are outsiders who buy the most sought-after items and flip them online for a profit. They scout inventory tips, track hot products and plan their shelf-clearing strategies accordingly. And they infuriate collectors like me. Nothing sours the thrill of the hunt faster than seeing a shelf cleared by someone who only wants to use your sacred collectibles for profit.

After feeling emotional pain myself, I wanted to understand why resellers bothered me so much, and what they meant for the communities that had become my lifeline. That frustration became the spark for my research. What I found surprised me.

As a collector, nothing frustrates me more than to say: According to my research, resellers paradoxically strengthen brand communities. Yes, you read that right. Resellers help communities, but not because they try to help members acquire their desired items. In fact, my findings indicate that resellers inflict heartbreak on community members – which was in line with what I saw and experienced.

Resellers help brand communities because they create a common enemy that the community can rally against. When resellers grab all the stock from a store shelf, collectors turn to each other. They vent. They strategize. They share tips on where to find certain items, offer to pick up extras for strangers and organize trades to help each other avoid inflated resale prices. Ironically, the people causing the most frustration also increase community engagement.

Brand communities are real communities

These communities reminded me that you are never truly alone in your darkest moments. Joining a niche community, whether for sneakers, trading cards, cars or even Squishmallows, can enrich your life far beyond the products themselves. It wasn’t the Squishmallows that helped me heal from loss; it was the connection that lived in threads, comments and group chats.

I even came to appreciate the “villains” of the community – resellers – for their role in bringing people together. Although I still think I deserve that strawberry cow more than they did.

The Conversation

Danielle Hass does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. How Squishmallow collecting helped me cope with grief, make new enemies and find ‘villains’ worth studying – https://theconversation.com/how-squishmallow-collecting-helped-me-cope-with-grief-make-new-enemies-and-find-villains-worth-studying-264569

How Philly anarcho-punks blended music, noise and social justice in the 1990s and 2000s

Source: The Conversation – USA (2) – By Edward Avery-Natale, Professor of Sociology, Mercer County Community College

A scene from R.A.M.B.O.’s last-ever show in Philadelphia (before a reunion in 2024) at Starlight Ballroom on May 27, 2007. Joseph A. Gervasi/LOUD! FAST! PHILLY!

While New York City is commonly considered the birthplace of American punk rock, just 100 miles south of the famous CBGB club where the Ramones and other early punk bands got their start is Philadelphia, which has had its own vibrant punk rock scene since at least 1974 – and it has persisted through the present day.

I am a professor of sociology at Mercer County Community College in New Jersey, lead editor of a forthcoming edited volume titled “Being and Punk,” and author of the 2016 book “Ethics, Politics, and Anarcho-Punk Identifications: Punk and Anarchy in Philadelphia.”

I’ve been a fan of punk rock music since I was 15 years old and have been an active member of punk scenes in Philadelphia and Fargo, North Dakota. I still attend punk shows and participate in the scene whenever I can.

Though the “birth” of punk is always a contentious subject, it is fair to say that, with the Ramones forming in 1974 and releasing the “Blitzkrieg Bop” single in February 1976 in the U.S., and the Sex Pistols performing their first show in November 1975 in the U.K., punk is at least 50 years old.

Given this milestone, I believe it’s worth looking back at the heyday of the anarchist-inflected punk scene in Philly in the 1990s and 2000s, and how the political ideology and activism – encouraging opposition to capitalism, government, hierarchy and more – is still influential today.

Man with face painted holds microphone and stands between two guitar players while fans scream and dance behind him
Philly hardcore punk band Ink & Dagger performs at the First Unitarian Church, circa late 1990s.
Justin Moulder

‘Not your typical rebellion’

In Philadelphia, and especially in West Philly, a number of collectively organized squats, houses and venues hosted shows, political events and parties, along with serving as housing for punks, in the 1990s and 2000s. In some cases, the housing itself was a form of protest – squatting in abandoned buildings and living cooperatively was often seen as a political action.

There was the Cabbage Collective booking shows at the Calvary Church at 48th and Baltimore Avenue. Stalag 13 near 39th and Lancaster Avenue is where the famous Refused played one of their final shows, and The Killtime right next door is where Saves the Day played in 1999 before becoming famous. The First Unitarian Church, an actual church in Center City, still regularly puts on shows in its basement.

These largely underground venues became central to the Philadelphia punk scene, which had previously lacked midsized spaces for lesser known bands.

Many Philly punks during this era mixed music subculture with social activism. As one anarcho-punk – a subgenre of punk rock that emphasizes leftist, anarchist and socialist ideals – I interviewed for my book told me:

“My mom … said, ‘I thought you were going to grow out of it. I didn’t understand it, and your dad and I were like, ‘What are we doing? She’s going out to these shows! She’s drinking beer!’ But then we’d be like, ‘She’s waking up the next morning to help deliver groceries to old people and organize feminist film screenings!’ We don’t know what to do, we don’t know how to deal with this; it’s not your typical rebellion.’”

Black-and-white photo of two male tattooed musicians singing and playing guitar while young men watch
Philly punk band R.A.M.B.O. performs in January 2006, with Tony
Joseph A. Gervasi/LOUD! FAST! PHILLY!

This quote captures the complex and ambiguous rebellion at the heart of anarcho-punk. On the one hand, it is a form of rebellion, often beginning in one’s teenage years, that contains the familiar trappings of youth subcultures: drug and alcohol consumption, loud music and unusual clothing, hairstyles, tattoos and piercings.

However, unlike other forms of teenage rebellion, anarcho-punks also seek to change the world through both personal and political activities. On the personal level, and as I showed in my book, many become vegan or vegetarian and seek to avoid corporate consumerism.

“I do pride myself on trying to not buy from sweatshops, trying to keep my support of corporations to a minimum, though I’ve loosened up over the years,” another interviewee, who was also vegan, said. “You’ll drive yourself crazy if you try to avoid it entirely, unless you … go live with [British punk band] Crass on an anarcho-commune.”

Love and rage in the war against war

Philly’s punk activists of that era spread their anarchist ideals through word and deed.

Bands like R.A.M.B.O., Mischief Brew, Flag of Democracy, Dissucks, Kill the Man Who Questions, Limp Wrist, Paint it Black, Ink and Dagger, Kid Dynamite, Affirmative Action Jackson and The Great Clearing Off, The Sound of Failure, and countless others, sang about war, capitalism, racism and police violence.

For example, on its 2006 single “War-Coma,” Witch Hunt reflected on the ongoing wars in Iraq and Afghanistan, laying blame on voters, government and religion:

24 years old went away to war / High expectations of what the future holds / Wore the uniform with pride a rifle at hand / Bringing democracy to a far away land / Pregnant wife at home awaiting his return / Dependent on faith, will she ever learn? / Ignore the consequences have faith in the Lord / Ignorance is bliss until reality sets in / Never wake up again

During live performances, bands would commonly discuss what the songs were about. And at merchandise tables, they sold T-shirts and records along with zines, books, patches and pins, all of which commonly contained political images or slogans.

Some bands became meta-critics of the punk scene itself, encouraging listeners to recognize that punk is about more than music.

In “Preaching to the Converted,” Kill The Man Who Questions critiqued the complaints bands would receive for becoming too preachy at shows:

“Unity” the battle cry / Youth enraged but don’t ask why / They just want it fast and loud, with nothing real to talk about / 18 hours in a dying van / Proud to be your background band.

In West Philadelphia, punks also staffed the local food cooperative and organized activist spaces – like the former A-Space on Baltimore Avenue and LAVA Zone on Lancaster Avenue where groups such as Food Not Bombs and Books Through Bars, among others, would operate. I personally organized a weekend gathering of the Northeastern Anarchist Network at LAVA in 2010.

Young adults wearing black clothes and bandannas and holding protest signs
Masked protesters walk away from City Hall after a march on July 30, 2000, a day before the start of the Republican National Convention in Philadelphia.
Roberto Schmidt/AFP via Getty Images

Punks raised money for charities and showed up to local protests against capitalist globalization and countless other causes. At the Republican National Convention in Philadelphia in the summer of 2000, black-clad punks whose faces were hidden behind masks marched in the streets along with an enormous cadre of local community organizations.

Punk not dead in Philly

Since punk’s earliest days, people have bemoaned that “punk is dead.”

In Philadelphia, I’ve seen how the anarcho-punk scene of the 1990s and 2000s has changed, but also how it continues to influence local bands and the values of punk rock broadly.

Many former and current members of the Philly anarcho-punk scene are still activists in various personal and professional ways. Among those I interviewed between 2006 and 2012 were social workers, labor organizers, teachers and professors, and school and drug counselors. For many, their professional lives were influenced by the anarchist ethics they had developed within the punk rock scene.

And many local punks showed up at the Occupy Philly camp and protests outside City Hall in 2011, and later marched in the streets during Black Lives Matter protests following the murder of George Floyd and killing of Breonna Taylor in 2020. They also participated in the homeless encampment on the Benjamin Franklin Parkway, also in 2020. And local punks I know continue to participate in grassroots campaigns like Decarcerate PA.

Anarchism and punk rock open up avenues for disaffected youth – in Philadelphia or anywhere else – to dream of a world without capitalism, coercive authorities, police and all forms of injustice.

In the words of R.A.M.B.O., one of the better known hardcore punk bands of the era and who released their latest Defy Extinction album in 2022: “If I can dream it, then why should I try for anything else?”

American flag on ground painted over with rainbow-filled anarchist symbol
Protesters alter a flag at the Occupy I.C.E. Philly encampment at City Hall in 2018.
Cory Clark/NurPhoto via Getty Images

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The Conversation

Edward Avery-Natale does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. How Philly anarcho-punks blended music, noise and social justice in the 1990s and 2000s – https://theconversation.com/how-philly-anarcho-punks-blended-music-noise-and-social-justice-in-the-1990s-and-2000s-264178