标题： 在线表达自我身份：社交媒体中自我呈现的左右翼和跨欧盟国家的差异 显示英文标题

标题： Expressing One's Identity Online: Left-Right and cross EU-country variation in self-representation in social media

摘要： 我们考察了来自八个欧洲联盟（EU）成员国的社交媒体用户如何表达他们的社会政治身份，重点在于用户在线自我呈现以及通过简介传达的群体身份线索。 我们的目标是探索左翼和右翼用户群体在欧盟国家内部及跨国家的社交媒体资料中讨论主题的共性和差异。 通过一种新方法，我们绘制了与身份相关的论述如何因国家和政治倾向而异，揭示了欧盟内部群体身份的表达方式。 我们发现，与民主、国家生活方式和去中心化相关的主题特别具有分裂性，在欧盟国家内部和国家之间都表现出显著的差异。 一些主题的子集，包括教育、环保主义、可持续性、平等、自由与人权以及传统道德等，明显区分了左翼和右翼倾向的用户群体。 这些党派主题具有相关性，因为它们可以被用来动员意识形态群体，并在欧盟层面突出左右翼的身份差异。 最后，我们表明，我们的左右翼身份相似性度量反映了现实世界政治碎片化的某些方面，这些方面与2022年PEW调查中各国对政治冲突强度的感知密切相关。 显示英文摘要

摘要： 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 & 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.