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            <funder>Authors (C.S., J.C., P.R.) acknowledge funding from the European Union’s Horizon Europe programme under grant agreement ID 101094752: Social Media for Democracy (SoMe4Dem).</funder>
            <funder>P.R. acknowledges funding from Project Liberty Institute project "AI-Political Machines".</funder>
            <funder>This project benefited from resources from the European Polarisation Observatory (EPO) of CIVICA Research (co-)funded by EU’s Horizon 2020 programme under grant agreement No 101017201 and from the Very Large Research Infrastructure (TGIR) Huma-Num of the CNRS, Aix-Marseille Université and Campus Condorcet.</funder>
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                <title xml:lang="fr">Exprimer son identité en ligne : Variations gauche-droite et transnationales au sein de l'UE dans l'autoreprésentation sur les réseaux sociaux</title>
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                <term xml:lang="en">Topic Modeling</term>
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              <p>We examine how social media users from eight European Union (EU) member states express their socio-political identities, focusing on users' online self-presentation and group identity cues conveyed through bios. Our goal is to explore commonalities and differences in topics discussed in social media profiles, across Left-and Right-wing user groups, within and across EU countries. Through a novel approach we map how identity-related discourse varies by country and political orientation, revealing how group identity is expressed within the EU. We find that topics related to democracy, national way of life, and decentralization emerge as particularly divisive, showing considerable variation both within and between EU countries. A subset of topics, which includes education, environmentalism, sustainability, equality, freedom &amp;amp; human rights, and traditional morality, among others, clearly differentiate Left-from Right-leaning user groups. These partisan topics are relevant as they could be leveraged for mobilizing ideological groups and highlight Left-Right identitarian differences at the EU level. Finally, we show that our Left-Right identity similarity metrics reflect aspects of real-world political fragmentation, which are closely aligned to the perceptions of political conflict intensity by country, as measured by the 2022 PEW survey.</p>
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              <p>Nous examinons comment les utilisateurs des réseaux sociaux de huit États membres de l'Union européenne (UE) expriment leurs identités sociopolitiques, en nous concentrant sur la présentation de soi en ligne et les indices identitaires de groupe véhiculés à travers les biographies. Notre objectif est d'explorer les points communs et les différences dans les sujets abordés dans les profils de réseaux sociaux, parmi les groupes d'utilisateurs de gauche et de droite, au sein des pays de l'UE et entre eux. Grâce à une approche innovante, nous cartographions les variations du discours lié à l'identité selon le pays et l'orientation politique, révélant comment l'identité de groupe est exprimée au sein de l'UE.Nous constatons que les sujets liés à la démocratie, au mode de vie national et à la décentralisation s’avèrent particulièrement clivants, avec des variations significatives à la fois au sein et entre les pays de l’UE. Un sous-ensemble de thèmes, incluant l’éducation, l’écologie, la durabilité, l’égalité, la liberté et les droits humains, ainsi que la morale traditionnelle, entre autres, permet de différencier clairement les groupes d’utilisateurs de gauche et de droite. Ces sujets partisans sont pertinents car ils pourraient être utilisés pour mobiliser des groupes idéologiques et mettent en lumière les différences identitaires entre gauche et droite à l'échelle de l'UE.Enfin, nous montrons que nos indicateurs de similarité identitaire gauche-droite reflètent certains aspects de la fragmentation politique réelle, étroitement alignés avec les perceptions de l'intensité des conflits politiques par pays, telles que mesurées par l'enquête PEW de 2022.</p>
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