{"id":2115,"date":"2025-03-31T17:39:16","date_gmt":"2025-03-31T17:39:16","guid":{"rendered":"https:\/\/kalogeratos.com\/psite\/?p=2115"},"modified":"2025-05-19T23:54:41","modified_gmt":"2025-05-19T23:54:41","slug":"workshop-on-diffusion-of-opinions-and-disinformation-ehess-paris","status":"publish","type":"post","link":"https:\/\/kalogeratos.com\/psite\/workshop-on-diffusion-of-opinions-and-disinformation-ehess-paris\/","title":{"rendered":"Workshop on diffusion of opinions and disinformation @EHESS-Paris"},"content":{"rendered":"<h2><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2116\" src=\"https:\/\/i0.wp.com\/kalogeratos.com\/psite\/wp-content\/uploads\/pplnet-985x576-1.jpg?resize=600%2C221&#038;ssl=1\" alt=\"\" width=\"600\" height=\"221\" srcset=\"https:\/\/i0.wp.com\/kalogeratos.com\/psite\/wp-content\/uploads\/pplnet-985x576-1.jpg?w=1920&amp;ssl=1 1920w, https:\/\/i0.wp.com\/kalogeratos.com\/psite\/wp-content\/uploads\/pplnet-985x576-1.jpg?resize=300%2C111&amp;ssl=1 300w, https:\/\/i0.wp.com\/kalogeratos.com\/psite\/wp-content\/uploads\/pplnet-985x576-1.jpg?resize=1024%2C378&amp;ssl=1 1024w, https:\/\/i0.wp.com\/kalogeratos.com\/psite\/wp-content\/uploads\/pplnet-985x576-1.jpg?resize=768%2C283&amp;ssl=1 768w, https:\/\/i0.wp.com\/kalogeratos.com\/psite\/wp-content\/uploads\/pplnet-985x576-1.jpg?resize=1536%2C566&amp;ssl=1 1536w, https:\/\/i0.wp.com\/kalogeratos.com\/psite\/wp-content\/uploads\/pplnet-985x576-1.jpg?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/kalogeratos.com\/psite\/wp-content\/uploads\/pplnet-985x576-1.jpg?w=1800&amp;ssl=1 1800w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/h2>\n<p><strong>vendredi 4 avril 2025<\/strong>,<strong> 9h45 &#8211; 18h<\/strong>, salle A4-32 (4\u00e8 \u00e9tage), EHESS 54, bd Raspail, 75006 Paris<\/p>\n<h5>s\u00e9ance sp\u00e9ciale du &#8220;<a href=\"https:\/\/cams.ehess.fr\/seminaire-systemes-complexes-en-sciences-sociales\" target=\"_blank\" rel=\"noreferrer noopener\">S\u00e9minaire Syst\u00e8mes complexes en sciences sociales<\/a>&#8220;<\/h5>\n<p><strong>Journ\u00e9e co-organis\u00e9e par le <a href=\"https:\/\/cams.ehess.fr\/\" target=\"_blank\" rel=\"noreferrer noopener\">CAMS<\/a> (EHESS-CNRS) et le <a href=\"https:\/\/centreborelli.ens-paris-saclay.fr\/fr\/presentation-du-centre-borelli\" target=\"_blank\" rel=\"noreferrer noopener\">Centre Borelli<\/a> (ENS Paris-Saclay-CNRS)<\/strong><\/p>\n<p>avec le soutien de l&#8217;<strong><a href=\"https:\/\/projet-anr-reach.math.cnrs.fr\/\" target=\"_blank\" rel=\"noreferrer noopener\">ANR ReaCh<\/a>.<\/strong><\/p>\n<h3>Programme provisoire<\/h3>\n<ul>\n<li>9h45 accueil<\/li>\n<li>10h &#8211; 11h : expos\u00e9s courts (20mn + 10mn de questions\/discussion)<\/li>\n<li>10h-10h30 <strong>Ferdinand Le Coz<\/strong><\/li>\n<li>10h30-11h <strong>Amina Azaiez<\/strong><\/li>\n<li>11h-11h15 pause<\/li>\n<li>11h15-12h30 <strong><a href=\"https:\/\/isp.cnrs.fr\/project\/fabien-tarissan\/\" target=\"_blank\" rel=\"noreferrer noopener\">Fabien Tarissan<\/a><\/strong> (ENS Paris-Saclay) &#8211; expos\u00e9 de 50mn + 10 \u00e0 20mn de questions\/discussion<\/li>\n<li>pause d\u00e9jeuner<\/li>\n<li>14h30-15h45 <strong><a href=\"https:\/\/research.pasteur.fr\/fr\/member\/paul-guille-escuret\/\" target=\"_blank\" rel=\"noreferrer noopener\">Paul Guille-Escuret<\/a> <\/strong>(Institut Pasteur)- expos\u00e9 de 50mn + 10 \u00e0 20mn de questions\/discussion<\/li>\n<li>15h45-16h pause<\/li>\n<li>16h-17h : expos\u00e9s courts (20mn + 10mn de questions\/discussion)<\/li>\n<li>16h-16h30 <strong>Chiara Giaquinta<\/strong><\/li>\n<li>16h30-17h <strong>Gaspard Abel<\/strong><\/li>\n<\/ul>\n<p><strong>Lieu<\/strong> : EHESS, 54 bd Raspail, Salle A4-32 (4\u00e8 \u00e9tage)<\/p>\n<p><strong>Inscription <\/strong>: participation sur place ou en ligne, <a href=\"https:\/\/participations.ehess.fr\/demandes\/__nouvelle__\" target=\"_blank\" rel=\"noreferrer noopener\">veuillez vous inscrire ici<\/a>. A la demande &#8220;Choisissez votre s\u00e9minaire&#8221;, saisir UE499 &#8211; attention, pas d&#8217;espace entre UE et 499 -, et s\u00e9lectionner le s\u00e9minaire. Une r\u00e9ponse automatique vous demandera de confirmer votre demande. La pr\u00e9cision &#8220;participation obligatoire en pr\u00e9sentiel&#8221; concerne uniquement les \u00e9tudiants inscrits \u00e0 une formation de l&#8217;EHESS.<\/p>\n<p><strong>Comit\u00e9 d&#8217;organisation<\/strong> :<\/p>\n<p>Gaspard Abel (Centre Borelli &amp; CAMS), Henri Berestycki (EHESS, CAMS), Argyris Kalogeratos (ENS Paris-Saclay, Centre Borelli), Jean-Pierre Nadal (CNRS, LPENS &amp; CAMS), Julien Randon-Furling (ENS Paris-Saclay, Centre Borelli), Camille Roth (CNRS &amp; EHESS, CAMS), Annick Vignes (INRAE &amp; ENPC, CAMS &amp; LISIS).<\/p>\n<p><strong>Contact<\/strong> : jpnadal@ehess.fr<\/p>\n<hr class=\"wp-block-separator\" \/>\n<hr class=\"wp-block-separator\" \/>\n<h3><strong>Titres et r\u00e9sum\u00e9s<\/strong><\/h3>\n<h4>(English versions at the bottom of page)<\/h4>\n<h4><strong>E<\/strong>xpos\u00e9s longs<\/h4>\n<ul>\n<li><strong>Fabien Tarissan<\/strong> (ENS Paris-Saclay)<\/li>\n<\/ul>\n<p><strong>Titre<\/strong> : Recommandation algorithmique et diversit\u00e9 de l\u2019information. Comment analyser l\u2019impact des algorithmes en ligne ?<\/p>\n<p><strong>R\u00e9sum\u00e9 <\/strong>: Que ce soit des probl\u00e9matiques de classement de l&#8217;information (moteurs de recherche) ou celles de la recommandation de contenus (via les r\u00e9seaux sociaux notamment), les algorithmes sont au c\u0153ur des processus de s\u00e9lection qui rendent visibles certaines informations en ligne. Ces choix algorithmiques ont de facto un fort impact sur l&#8217;activit\u00e9 des utilisateurs et, d\u00e8s lors, sur leur acc\u00e8s \u00e0 l&#8217;information. Ceci soul\u00e8ve la question de notre capacit\u00e9 \u00e0 mesurer la qualit\u00e9 de ces choix algorithmes ainsi que leur impact sur les utilisateurs.<br \/>\nDans cet expos\u00e9, je montrerai comment les structures relationnelles d\u00e9crivant l&#8217;activit\u00e9 d&#8217;utilisateurs en ligne peut \u00eatre analys\u00e9es et mod\u00e9lis\u00e9es afin de r\u00e9v\u00e9ler la diversit\u00e9 de l&#8217;information \u00e0 laquelle ils sont expos\u00e9s.<\/p>\n<ul>\n<li><strong>Paul Guille-Escuret <\/strong>(Institut Pasteur)<\/li>\n<\/ul>\n<p><strong>Titre <\/strong>: Faire ses \u00ab\u00a0propres recherches\u00a0\u00bb pour lutter contre la d\u00e9sinformation, sociologie d\u2019un vigilantisme num\u00e9rique en faveur de la vaccination.<\/p>\n<p><strong>R\u00e9sum\u00e9 <\/strong>: Les controverses vaccinales restent largement repr\u00e9sent\u00e9es comme un combat opposant les autorit\u00e9s sanitaires \u00e0 des militants anti-vaccins profanes devenus un symbole des rapports probl\u00e9matiques que les populations entretiendraient aux technologies et \u00e0 la science. Bien avant la pand\u00e9mie de Covid-19, les acteurs critiques de la vaccination \u00e9taient pourtant d\u00e9j\u00e0 aux prises avec un contre-mouvement pr\u00e9sent\u00e9 comme une r\u00e9ponse citoyenne face au manque de r\u00e9gulation de la d\u00e9sinformation en ligne. \u00c0 partir d\u2019une ethnographie men\u00e9e au sein de collectifs Facebook et d\u2019entretiens r\u00e9alis\u00e9s avec leurs mod\u00e9rateurs, une part importante de mon travail de th\u00e8se donne \u00e0 voir les coulisses de ce militantisme num\u00e9rique \u00ab\u00a0pro-vaccins\u00a0\u00bb, ses r\u00e9tributions et ses tensions normatives. Si mes r\u00e9sultats montrent que ces mobilisations ne sont pas r\u00e9ductibles \u00e0 leurs composantes antagonistiques, ils attirent aussi l\u2019attention sur l\u2019\u00e9mergence d\u2019une d\u00e9fense de la Science de plus en plus d\u00e9connect\u00e9e des institutions scientifiques. Tout comme ceux qu\u2019ils d\u00e9signent comme adversaires, ces militants peuvent \u00eatre des autodidactes, des profanes qui \u00ab\u00a0font leurs propres recherches\u00a0\u00bb.<\/p>\n<hr class=\"wp-block-separator\" \/>\n<p><strong>Expos\u00e9s courts<\/strong>.<\/p>\n<ul>\n<li><strong>Amina Azaiez<\/strong> (Univ. Paris 1 Panth\u00e9on-Sorbonne, Centre d\u2019\u00c9conomie de la Sorbonne) &#8211; doctorante avec Antoine Mandel.<\/li>\n<\/ul>\n<p><strong>Titre <\/strong>: Analyse du r\u00e9seau de lobbying de la Commission europ\u00e9enne par une mod\u00e9lisation en hypergraphe.<\/p>\n<p><strong>R\u00e9sum\u00e9 <\/strong>: Notre \u00e9tude explore dans quelle mesure le r\u00e9seau de lobbying aupr\u00e8s de la Commission europ\u00e9enne (CE) est domin\u00e9 par un cercle restreint d\u2019acteurs bien connect\u00e9s et comment l\u2019influence se distribue entre les diff\u00e9rents types d\u2019acteurs. Nous utilisons un ensemble de donn\u00e9es exhaustif et accessible au public, comprenant plus de 18 000 r\u00e9unions organis\u00e9es dans le cadre d\u2019un processus de consultation des parties prenantes. Nous mod\u00e9lisons ces interactions en face \u00e0 face en construisant un hypergraphe dont les n\u0153uds repr\u00e9sentent les repr\u00e9sentants de la CE et les parties prenantes, tandis que les hyperliens relient les entit\u00e9s participant aux m\u00eames r\u00e9unions. Notre analyse met en \u00e9vidence une structure hi\u00e9rarchique de type centre-p\u00e9riph\u00e9rie, o\u00f9 un nombre restreint d&#8217;entit\u00e9s bien connect\u00e9es occupent le centre du r\u00e9seau et b\u00e9n\u00e9ficient d&#8217;une int\u00e9gration stable dans le processus d\u00e9cisionnel de la CE. L\u2019analyse de la composition du centre r\u00e9v\u00e8le que les entreprises et les associations professionnelles entretiennent des relations plus proches avec la CE. Une analyse de r\u00e9gression montre que les efforts de lobbying et la taille des entreprises sont des pr\u00e9dicteurs significatifs de la centralit\u00e9 des entreprises, ind\u00e9pendamment d\u2019autres caract\u00e9ristiques objectives. Nos r\u00e9sultats fournissent des preuves quantitatives soutenant l\u2019id\u00e9e que le lobbying est un outil domin\u00e9 par des acteurs bien connect\u00e9s, tout en mettant en lumi\u00e8re des strat\u00e9gies de lobbying vari\u00e9es selon les cat\u00e9gories d\u2019acteurs.<\/p>\n<ul>\n<li><strong>Ferdinand Le Coz<\/strong> (IRIT, Toulouse)<\/li>\n<\/ul>\n<p>Titre : Unsupervised detection of persistent communities in dynamic networks using Networks embeddings.<\/p>\n<p><strong>R\u00e9sum\u00e9 <\/strong>: Je m&#8217;int\u00e9resse aux R\u00e9seaux de Neurones de Graphes (GNN) pour l&#8217;\u00e9tude de r\u00e9seaux dynamiques. Je propose algorithme pour d\u00e9tecter les communaut\u00e9s dynamiques \u00e0 partir d&#8217;embeddings de graphes sans connaissance \u00e0 priori de la structure de ces communaut\u00e9s. J&#8217;exposerai bri\u00e8vement une m\u00e9thode de g\u00e9n\u00e9ration de graphes dynamiques et de features pour tester l&#8217;algorithme et discuter de l&#8217;impact des features sur les repr\u00e9sentations produites par les GNNs. Enfin, je pr\u00e9senterai un cas d&#8217;\u00e9tude o\u00f9 j&#8217;essaie de retrouver les communaut\u00e9s politiques sur Twitter \u00e0 partir des Retweets entre utilisateurs lors d&#8217;une campagne pr\u00e9sidentielle en France.<\/p>\n<ul>\n<li><strong>Gaspard Abel<\/strong> (ENS Paris-Saclay, Centre Borelli &amp; CAMS) &#8211; doctorant avec Argyris Kalogeratos, Julien Randon-Furling &amp; Jean-Pierre Nadal.<\/li>\n<\/ul>\n<p><strong>Titre<\/strong> :\u00a0 Analyse de l&#8217;activit\u00e9 des r\u00e9seaux sociaux \u00e0 l&#8217;aide de processus temporels ponctuels conjoints pour l&#8217;interaction entre l\u2019utilisateur et le sujet.<\/p>\n<p><strong>R\u00e9sum\u00e9<\/strong> : Les media sociaux ont radicalement modifi\u00e9 la mani\u00e8re dont les gens per\u00e7oivent les flux d&#8217;informations auxquels ils sont expos\u00e9s, et la propagation d&#8217;une multitude d&#8217;informations ou de comportements dans une population est souvent interconnect\u00e9e. Dans ce travail, nous introduisons le mod\u00e8le MIC (Mixture of Interacting Cascades), qui est bas\u00e9 sur des processus de Hawkes multidimensionnels marqu\u00e9s. Le mod\u00e8le MIC d\u00e9crit conjointement les interactions non triviales entre les utilisateurs et les cascades d&#8217;informations. Nous introduisons notamment une visualisation en couche afin de r\u00e9v\u00e9ler le couplage entre la structure du r\u00e9seau social et les alignements de sujets.<\/p>\n<p>&nbsp;<\/p>\n<hr class=\"wp-block-separator\" \/>\n<hr class=\"wp-block-separator\" \/>\n<h4>Titles and abstracts &#8211; English versions<\/h4>\n<hr class=\"wp-block-separator\" \/>\n<ul>\n<li><strong>Fabien Tarissan<\/strong> (ENS Paris-Saclay)<\/li>\n<\/ul>\n<p><strong>Title:<\/strong>\u00a0 Recommendation algorithms and information diversity: how to analyze its impact in online platforms ?<\/p>\n<p><strong>Abstract<\/strong>: Whether it be in the context of information ranking (e.g. search engines) or content recommendation (on social networks for instance), algorithms are at the core of processes selecting which information is made visible.\u00a0 Those algorithmic choices have de facto a strong impact on user&#8217;s activity and therefore on their access to information. This raises the question of measuring the quality of the choices made by algorithms and their impact on the users.<br \/>\nIn this presentation, we will discuss how to exploit the network structure generated by user&#8217;s activity in order to reveal the diversity of the information they access.<\/p>\n<ul>\n<li><strong><strong>Paul Guille-Escuret <\/strong>(Institut Pasteur) <\/strong><\/li>\n<\/ul>\n<p><strong>Title<\/strong>: Doing their \u201cown research\u201d to fight misinformation, sociology of a digital vigilantism in favor of vaccination.<\/p>\n<p><strong>Abstract<\/strong>: Vaccine controversies are largely portrayed as a struggle between health authorities and anti-vaccine activists, who have become a symbol of the problematic relationship that people maintain with technology and science. However, long before the Covid-19 pandemic, critics of vaccination were already facing a counter-movement presented as a civic response to the lack of regulation regarding online misinformation. Drawing from ethnographic research conducted within Facebook groups and interviews with their moderators, a key part of my doctoral work takes a behind-the-scenes look at this digital &#8220;pro-vaccine&#8221; activism, its rewards, and its normative tensions. While my findings indicate that these mobilizations cannot be reduced to their antagonistic side, they also draw attention to the emergence of a defense of Science that is increasingly disconnected from scientific institutions. Just like those they identify as adversaries, these activists can be self-taught individuals, laypersons who &#8220;conduct their own research&#8221;.<\/p>\n<hr class=\"wp-block-separator\" \/>\n<p><strong>Short talks<\/strong><\/p>\n<ul>\n<li><strong>Amina Azaiez<\/strong> (Univ. Paris 1 Panth\u00e9on-Sorbonne, Centre d\u2019\u00c9conomie de la Sorbonne)<\/li>\n<\/ul>\n<p><strong>Title<\/strong>: A Hypergraph Analysis of the European Commission Lobby Network<\/p>\n<p><strong>Abstract<\/strong>: Our work addresses the research question of whether the European Commission (EC) lobby network is dominated by a select group of well-connected actors and how influence is distributed among different types of actors. We use a comprehensive, publicly available dataset encompassing over 18,000 meetings as part of a stakeholder consultation process. We model these face-to-face interactions by constructing a hypergraph whose nodes are EC officials and stakeholders, and hyperedges connect entities that participate in the same meetings. Our analysis highlights the presence of a hierarchical core-periphery structure, with a few well-connected entities that occupy the center of the network and enjoy a stable integration in the EC policy-making process. Examination of the core composition reveals that companies and trade associations maintain closer relationships with the EC. A regression analysis shows that lobbying efforts and company size are significant predictors of company centrality, independent of other objective characteristics. Our findings provide quantitative evidence supporting the perception of lobbying as a tool dominated by well-connected actors, while also revealing heterogeneous lobbying strategies across stakeholder groups.<\/p>\n<ul>\n<li><strong>Ferdinand Le Coz<\/strong> (IRIT, Toulouse)<\/li>\n<\/ul>\n<p><strong>Title<\/strong>: Unsupervised detection of persistent communities in dynamic networks using Networks embeddings.<\/p>\n<p><strong>Abstract<\/strong>: My research focuses on the use of Graph Neural Networks for the study of dynamic networks. I propose a general framework to discover dynamic communities without a-priori knowledge of these communities. I will present a synthetic dynamic graph and features generator to investigate the performances of the proposed framework. I will further discuss the impact of features on the representations produced by GNNs. Finally, I will test the method on a real-world Twitter dataset of retweets to try to recover the political communities of users.<\/p>\n<ul>\n<li><strong>Gaspard Abel<\/strong> (ENS Paris-Saclay, Centre Borelli &amp; CAMS)<\/li>\n<\/ul>\n<p><strong>Title<\/strong>: Uncovering social network activity using joint Temporal Point Processes for user and topic interaction<\/p>\n<p><strong>Abstract<\/strong>:\u00a0Online social platforms have drastically affected the way people apprehend the information flows to which they are exposed, and the spread of multiple pieces of information or beliefs in a networked population is rarely uncorrelated. In this work we introduce here the Mixture of Interacting Cascades (MIC) model, which is based on marked Multidimensional Hawkes processes. MIC models jointly non-trivial interactions between users and information cascades. Moreover, we show how derivative layered visualizations can reveal the coupling between social network structure and topic alignments.<\/p>\n<p>&nbsp;<\/p>\n<p>Lien d&#8217;evenement : <a href=\"https:\/\/cams.ehess.fr\/diffusion-dopinions-desinformation\">https:\/\/cams.ehess.fr\/diffusion-dopinions-desinformation<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>vendredi 4 avril 2025, 9h45 &#8211; 18h, salle A4-32 (4\u00e8 \u00e9tage), EHESS 54, bd Raspail, 75006 Paris s\u00e9ance sp\u00e9ciale du &#8220;S\u00e9minaire Syst\u00e8mes complexes en sciences sociales&#8220; Journ\u00e9e co-organis\u00e9e par le CAMS (EHESS-CNRS) et le Centre Borelli (ENS Paris-Saclay-CNRS) avec le soutien de l&#8217;ANR ReaCh. Programme provisoire 9h45 accueil 10h &#8211; 11h : expos\u00e9s courts (20mn [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[43],"tags":[50],"class_list":["post-2115","post","type-post","status-publish","format-standard","hentry","category-events","tag-workshop"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Workshop on diffusion of opinions and disinformation @EHESS-Paris - Argyris Kalogeratos<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kalogeratos.com\/psite\/workshop-on-diffusion-of-opinions-and-disinformation-ehess-paris\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Workshop on diffusion of opinions and disinformation @EHESS-Paris - Argyris Kalogeratos\" \/>\n<meta property=\"og:description\" content=\"vendredi 4 avril 2025, 9h45 &#8211; 18h, salle A4-32 (4\u00e8 \u00e9tage), EHESS 54, bd Raspail, 75006 Paris s\u00e9ance sp\u00e9ciale du &#8220;S\u00e9minaire Syst\u00e8mes complexes en sciences sociales&#8220; Journ\u00e9e co-organis\u00e9e par le CAMS (EHESS-CNRS) et le Centre Borelli (ENS Paris-Saclay-CNRS) avec le soutien de l&#8217;ANR ReaCh. 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