Antoine Vendeville

Co-evolution of groups and opinions in an agent-based model This study explores a model for the co-evolution of opinions and groups, related to opinion polarization and group identity in opinion dynamics. While traditional models focus on pairwise interactions...

New paper out in Plos One !

By integrating group identities and affective polarization in opinion dynamics, we show that out-group intolerance is the main driver of ideological polarization.

doi.org/10.1371/jour...

Signed Networks: theory, methods, and applications Signed networks provide a principled framework for representing systems in which interactions are not merely present or absent but qualitatively distinct: friendly or antagonistic, supportive or confl...

Our team just released a comprehensive and accessible review of Signed Networks — two years in the making! Theory, methods, applications, all in one place. Feedback welcome.
arxiv.org/abs/2511.17247

Happy to present at the Computational Social Science satellite, with the recent news this same paper was accepted just a few days ago. For now, you can see the updated preprint here: arxiv.org/abs/2409.13461

New X dataset is out !

A public database with measurements of multidimensional political opinions, activity and popularity for almost a million X users 🔥

Including politicians and media outlets 🌍

Preprint: hal.science/hal-05222448
Data: osf.io/at5q2/

Applications for #WWCS26 are officially OPEN! ❄️
Join us in Mallorca for an unforgettable edition.
Apply now via the link in website 🌐

DSA Ad Repository Data Sprint | médialab Sciences Po A data sprint on platforms advertising registries took place at the médialab in the week of 24 February 2025. Organised by The Open Institute for Digital Transformations and by the project ‘Putting th...

Earlier this year, a DSA Ad Repository Data Sprint was held at the médialab.

Organised by The Open Institute for Digital Transformations and the project ‘Putting the DSA into Practice’, the event brought together six groups to explore platform transparency from different angles.

Full article 🔽

Modeling a French Election A fine-grained database of Twitter posts gathered during the 2017 French presidential election validates a popular network model of opinion dynamics.

Also featured in @physicsmagazine.bsky.social 😀

physics.aps.org/articles/v18...

I study a retweet network collected during the 2017 French presidential elections where accounts of political entities are fixed as reference points. I show that in its equilibrium state, the Voter Model correctly identifies ground-truth opinions of more than 92% of the users.

Happy to present my latest article in @physreve.bsky.social
! In this paper, I show that the Voter Model can predict individual opinions in a large, heterogeneous online population.

doi.org/10.1103/Phys...

Quel avenir pour les réseaux sociaux ? | médialab Sciences Po Le médialab de Sciences Po et le Centre Internet et Société du CNRS s’associent à l’occasion d’une soirée pour faire dialoguer chercheurs, entrepreneurs, journalistes et experts autour d’une question ...

Ce mercredi à 19h, ne manquez pas la conférence du Centre Internet et Société du @cnrs.fr et du médialab de @sciencespo.bsky.social.

Au programme, des tables rondes animées par @manonberriche.bsky.social et @algoglitch.bsky.social

Inscription : medialab.sciencespo.fr/actu/le-rese...

Creativity is a trading zone: Charting the everyday co-construction of algorithmic agency | médialab Sciences Po Le médialab accueille Gabriele de Seta pour le prochain séminaire du 18 mars 2025. Il présentera ses travaux sur les communautés de créateurs d'IA générative et analysera le statut du discours sur la ...

Ne manquez pas l’intervention de Gabriele de Seta lors du séminaire du mardi 18 mars.
Au programme, un échange autour de la créativité à l’ère de l’intelligence artificielle et une analyse des discours autour du concept.
Plus d’infos : medialab.sciencespo.fr/actu/creativ...

Expressing One's Identity Online Left-Right and cross EU-country variation in self-representation in social media This seminar will explore how left- and right-wing users express their sociopolitical identities on social media in eight EU countries, revealing notable variations…

Retrouvez le séminaire "Expressing One's Identity Online: Left-Right and cross EU-country variation in self-representation in social media" avec @santagiustina.bsky.social

Explorez les identités sociopolitiques sur les réseaux sociaux dans 8 pays l'UE.

Disponible sur le compte Vimeo du médialab ⬇️

📅Save the date!

Join us next Monday (Mar 10th, 11 AM ET) for our next seminar by @emmafraxanet.bsky.social from Pompeu Fabra University, who will discuss polarization in online communities.

Don't miss out! ✨

Super proud of this work !

I show that the ubiquitous voter model can effectively predict individual opinions of Twitter users 😎

This marks a new step in the study of the empirical validity of theoretical models for opinion dynamics !

arxiv.org/abs/2501.13215

🚨New paper alert! 🚨 How do echo chambers form in signed networks? 🤔 A new study by @avdeville.bsky.social and myself explores the role of structural balance in shaping information flows and inducing echo chambers. 🧵👇