Pedro Ramaciotti

53
Documents

Publications

Publications

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Approximating Ideology Scaling of Online Social Networks with Factor Analysis Identifying Dimensions with Survey Reference Frames

Pedro Ramaciotti Morales , Benjamin Gilbert , Zografoula Vagena

2026

Pré-publication, Document de travail hal-05497770v1
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Recommender system in X inadvertently profiles ideological positions of users

Paul Bouchaud , Pedro Ramaciotti Morales

2026

Pré-publication, Document de travail hal-05468493v1
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Expressing Political Identity Online: Differential issue-based self-identification across the Left–Right spectrum

Carlo Romano Marcello Alessandro Santagiustina , Jean-Philippe Cointet , Pedro Ramaciotti Morales

2026

Pré-publication, Document de travail (preprint/prepublication) hal-04874311v3
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Mapping the political landscape from data traces: multidimensional opinions of users, politicians and media outlets on X

Antoine Vendeville , Jimena Royo-Letelier , Duncan Cassells , Jean-Philippe Cointet , Maxime Crépel et al.

2026

Pré-publication, Document de travail hal-05222448v2
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Efficient computational methods for the estimation of ideal points in social sciences

Ioannis Chalkiadakis , Gareth W Peters , Pedro Ramaciotti Morales

2026

Pré-publication, Document de travail hal-05498685v1
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Political attitudes differ but share a common low-dimensional structure across social media and survey data

Antoine Vendeville , Hiroki Yamashita , Pedro Ramaciotti

2026

Pré-publication, Document de travail hal-05533717v1
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Community Notes undermoderate polarizing content by design creating risks in electoral processes

Paul Bouchaud , Pedro Ramaciotti

2026

Pré-publication, Document de travail hal-05116614v2
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Co-evolution of groups and opinions in agent-based models

Duncan Cassells , Antoine Vendeville , Lionel Tabourier , Pedro Ramaciotti

2025

Pré-publication, Document de travail hal-05146797v1
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How do Recommender Systems Learn Political Opinions? A Semi-Synthetic Step-by-Step Experiment

Tim Faverjon , Jean-Philippe Cointet , Pedro Ramaciotti

2025

Pré-publication, Document de travail hal-05188170v2
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Web Crawler Restrictions, AI Training Datasets & Political Biases

Paul Bouchaud , Pedro Ramaciotti

2025

Pré-publication, Document de travail hal-05302425v1
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Linear socio-demographic representations emerge in Large Language Models from indirect cues

Paul Bouchaud , Pedro Ramaciotti

2025

Pré-publication, Document de travail hal-05410269v1
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Tracking Inauthentic Amplification on Social Media: A Scalable Method to Detect Duplicated Messages

Manon Richard , Agnès Mustar , Lisa Giordani , Cristián Brokate , Paul Bouchaud et al.

2025

Pré-publication, Document de travail hal-05301215v2
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Representation, Political Discontent and e-Petitions: How economic ideology and anti-elitism drive online petitioning in the EU

Carlo Romano Marcello Alessandro Santagiustina , Pedro Ramaciotti Morales

2025

Pré-publication, Document de travail (preprint/prepublication) hal-05389645v2
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Inferring Attitudinal Spaces in Social Networks

Pedro Ramaciotti Morales , Jean-Philippe Cointet , Gabriel Muñoz Zolotoochin , Antonio Fernández Peralta , Gerardo Iñiguez et al.

2022

Pré-publication, Document de travail hal-03573188v1
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The geometry of misinformation: embedding Twitter networks of users who spread fake news in geometrical opinion spaces

Pedro Ramaciotti Morales , Manon Berriche , Jean-Philippe Cointet

2022

Pré-publication, Document de travail hal-03725556v2
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Le cadran de la visibilité de la sphere médiatique et politique sur YouTube

Bilel Benbouzid , Emma Gauthier , Pedro Ramaciotti , Bertrand Roudier , Tommaso Venturini

2020

Pré-publication, Document de travail hal-03046284v1
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Seeing in the dark: Towards a broad construction of the access to data provisions of the DSA

Beatriz Botero Arcila , Pedro Ramaciotti , Emma Cabale

Internet Policy Review, 2026, 15 (1), ⟨10.14763/2026.1.2085⟩

Article dans une revue hal-05522872v1
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Mapping the e-petition ecosystem through Social Media: mobilization in the EU across issues and ideologies

Carlo Romano Marcello Alessandro Santagiustina , Pedro Ramaciotti Morales

Journal of Quantitative Description: Digital Media, 2026, 6, pp.1-34. ⟨10.51685/jqd.2026.001⟩

Article dans une revue hal-05264876v2
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Co-evolution of groups and opinions in an agent-based model

Duncan Cassells , Antoine Vendeville , Lionel Tabourier , Pedro Ramaciotti

PLoS ONE, 2025, 20 (12), pp.e0338486. ⟨10.1371/journal.pone.0338486⟩

Article dans une revue hal-05417944v1
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Flooding the Feed: The Politics of Social Media Sharing Among Defensive Publics

Katharina Tittel , William Allen , Pedro Ramaciotti

Political Communication, 2025, pp.1-32. ⟨10.1080/10584609.2025.2588248⟩

Article dans une revue hal-05373547v1
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Nos traces numériques au service de la régulation des plateformes

Pedro Ramaciotti Morales , Jean-Pilippe Cointet , Tim Faverjon

Comprendre son temps, 2024, 2, pp.58-65

Article dans une revue hal-04837623v1
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American Politics in 3D: Measuring multidimensional issue alignment in social media using social graphs and text data

Pedro Ramaciotti , Duncan Cassells , Zografoula Vagena , Jean-Philippe Cointet , Michael Bailey

Applied Network Science, 2024, ⟨10.1007/s41109-023-00608-w⟩

Article dans une revue hal-04363008v1
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Auditing the audits: evaluating methodologies for social media recommender system audits

Paul Bouchaud , Pedro Ramaciotti Morales

Applied Network Science, 2024, ⟨10.1007/s41109-024-00668-6⟩

Article dans une revue hal-04699600v1
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Tweeting apart: Democratic backsliding, new party cleavage and changing media ownership in Turkey

Omer Faruk Metin , Pedro Ramaciotti Morales

Party Politics, 2022, ⟨10.1177/13540688221135019⟩

Article dans une revue hal-03668042v3
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Posters and protesters

Pedro Ramaciotti Morales , Jean-Philippe Cointet , Caterina Froio

Journal of Computational Social Science, In press, ⟨10.1007/s42001-022-00163-x⟩

Article dans une revue hal-03606955v1
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Measuring diversity in heterogeneous information networks

Pedro Ramaciotti Morales , Robin Lamarche-Perrin , Raphaël Fournier-S'Niehotta , Rémy Poulain , Lionel Tabourier et al.

Theoretical Computer Science, 2021, 859, pp.80-115. ⟨10.1016/j.tcs.2021.01.013⟩

Article dans une revue hal-03608575v1
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What colours are the yellow vests? An ideological scaling of Facebook groups

Jean-Philippe Cointet , Pedro Ramaciotti Morales , Dominique Cardon , Caterina Froio , Andrei Mogoutov et al.

Statistique et Société, 2021, Statistique et Société, 9 (1-2), pp.79-107

Article dans une revue halshs-03299366v1
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De quelle(s) couleur(s) sont les Gilets jaunes ? Plonger des posts Facebook dans un espace idéologique latent

Jean-Philippe Cointet , Pedro Ramaciotti Morales , Dominique Cardon , Caterina Froio , Andrei Mogoutov et al.

Statistique et Société, 2021, Gilets jaunes et Grand Débat National : outils, données et analyses, 9 (1-2), pp.79-107

Article dans une revue hal-03856216v1

About Some Boundary Integral Operators on the Unit Disk Related to the Laplace Equation

Pedro Ramaciotti , Jean-Claude Nédélec

SIAM Journal on Numerical Analysis, 2017, 55 (4), pp.1892 - 1914. ⟨10.1137/15M1033721⟩

Article dans une revue hal-01609519v1
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Measuring ideological polarization across the world on comparable political dimensions using social media and political survey data

Pedro Ramaciotti

11th International Conference on Computational Social Science (IC2S2- 2025), Jul 2025, Norköpping, Sweden

Communication dans un congrès hal-05199796v1
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Modeling both pairwise interactions and group effects in polarization on interaction networks

Duncan Cassells , Lionel Tabourier , Pedro Ramaciotti

International Conference on Complex Networks, Apr 2024, Exetrer, United Kingdom

Communication dans un congrès hal-04363001v1
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Discovering ideological structures in representation learning spaces in recommender systems on social media data

Tim Faverjon , Pedro Ramaciotti

2023 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining, Nov 2023, Kusadasi, Turkey. ⟨10.1145/3625007.3627336⟩

Communication dans un congrès hal-04297854v1
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Emoji, Language Games and Political Polarisation

Sara Luxmoore , Jonathan Cardoso Silva , Pedro Ramaciotti

Fourth Conference on Computational Humanities Research, Dec 2023, Paris, France

Communication dans un congrès hal-04297824v1
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Fake news diffusion in geometrical attitudinal spaces

Pedro Ramaciotti Morales , Manon Berriche , Jean-Philippe Cointet

8th International Conference on Computational Social Sciences, Jul 2022, Chicago, United States

Communication dans un congrès hal-03653473v1
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Text-free multi-issue attitude mining from social network graph data

Pedro Ramaciotti Morales , Jean-Philippe Cointet , Armin Pournaki

8th International Conference on Computational Social Sciences, Jul 2022, Chicago, United States

Communication dans un congrès hal-03653479v1
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Measuring the accuracy of social network ideological embeddings using language models

Pedro Ramaciotti Morales , Gabriel Muñoz Zolotoochin

2022 International Conference on Information Technology & Systems (ICITS22), Feb 2022, San José, Costa Rica

Communication dans un congrès hal-03385061v1
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Multidimensional online American politics: Mining emergent social cleavages in social graphs

Pedro Ramaciotti Morales

The 11th International Conference on Complex Networks and their Applications, Nov 2022, Palermo, Italy

Communication dans un congrès hal-03721438v1
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Embedding social graphs from multiple national settings in common empirical opinion spaces

Pedro Ramaciotti Morales , Zografoula Vagena

2022 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining, Nov 2022, Istambul, Turkey

Communication dans un congrès hal-03783628v1
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Ideological, semantic and geographic proximity drive following behaviour on Twitter

Armin Pournaki , Pedro Ramaciotti Morales , Jean-Philippe Cointet

8th International Conference on Computational Social Sciences, Jul 2022, Chicago, United States, Jul 2022, Chicago, United States

Communication dans un congrès hal-03655036v1
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Unfolding the dimensionality structure of social networks in ideological embeddings

Pedro Ramaciotti Morales , Jean-Philippe Cointet , Gabriel Muñoz Zolotoochin

2021 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM), Nov 2021, Amsterdam, Netherlands

Communication dans un congrès hal-03315759v3
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Uncovering the structure of the French media ecosystem

Jean-Philippe Cointet , Dominique Cardon , Andreï Mogoutov , Benjamin Ooghe , Guillaume Plique et al.

IC2S2, Jul 2021, Zurich, Switzerland. ⟨10.48550/arXiv.2107.12073⟩

Communication dans un congrès halshs-03299024v1
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Online Social Movements Dynamics in Ideological Spaces

Pedro Ramaciotti Morales , Jean-Philippe Cointet

7th International Conference on Computational Social Science IC2S2, Jul 2021, Zurich, Switzerland

Communication dans un congrès hal-03343536v1
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Auditing the Effect of Social Network Recommendations on Polarization in Geometrical Ideological Spaces

Pedro Ramaciotti Morales , Jean-Philippe Cointet

RecSys ’21: 15th ACM Conference on Recommender Systems, Sep 2021, Amsterdam, Netherlands. ⟨10.1145/3460231.3478851⟩

Communication dans un congrès hal-03320208v1
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Your most telling friends: Propagating latent ideological features on Twitter using neighborhood coherence

Pedro Ramaciotti Morales , Jean-Philippe Cointet , Julio Laborde

2020 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM), 2020, Amsterdam, Netherlands. pp.217-221, ⟨10.1109/ASONAM49781.2020.9381468⟩

Communication dans un congrès hal-03700094v1
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Testing the Impact of Semantics and Structure on Recommendation Accuracy and Diversity

Pedro Ramaciotti Morales , Lionel Tabourier , Raphaël Fournier-S'Niehotta

ASONAM 2020. IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining, 2020, La Hague (virtual), Netherlands

Communication dans un congrès hal-02999863v1
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Role of the Website Structure in the Diversity of Browsing Behaviors

Pedro Ramaciotti Morales , Lionel Tabourier , Sylvain Ung , Christophe Prieur

30th ACM Conference on Hypertext and Social Media, Sep 2019, Hof, Germany. pp.133-142, ⟨10.1145/3342220.3343648⟩

Communication dans un congrès hal-02422544v1
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Depolarizing and moderating social media with AI

Pedro Ramaciotti

CNRS. 2024, https://static.ie.edu/CGC/AI4D%20Paper%202%20Depolarizing%20and%20Moderating%20Social%20Media%20with%20AI.pdf

Rapport hal-04754503v1
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Attitudinally-positioned European sample dataset

Pedro Ramaciotti Morales , Jimena Royo-Letelier , Jean-Philippe Cointet , Armin Pournaki

sciences po. 2024, 18 p

Rapport hal-04807916v1

The Effects of Disaggregated Factors of YouTube Recommendations in Diversity

Pedro Ramaciotti Morales , Bilel Benbouzid , Alexis Perrier , Emma Gauthier

International Conference on Computational Social Science IC2S2, Jul 2020, Cambridge, MA, United States. 2020

Poster de conférence hal-03580268v1