Echo Chambers：Facebook上的情绪传染和群体极化
Echo Chambers: Emotional Contagion and Group Polarization on Facebook
摘要：
最近的研究结果表明，Facebook上的用户倾向于选择符合他们信仰体系的信息，并形成两极分化的群体，即，回音室这种趋势主导着信息的传递，并可能影响关于社会相关问题的公共辩论。在这项工作中，我们通过考虑用户的情绪和参与度来探索感兴趣社区的结构演变。专注于报告科学和阴谋内容的Facebook页面，我们通过将每日分辨率数据与三个增长模型（即Gompertz模型，Logistic模型和Log-logistic模型）拟合来描述两个社区规模的演变。然后，我们探讨了情感状态和参与的用户在群体动态之间的相互作用。我们的研究结果表明，社区的情感行为受到用户在回声室中的参与的影响。事实上，更高的参与程度对应着更消极的态度。此外，我们观察到，平均而言，更活跃的用户比不太活跃的用户更快地转向消极。
英文摘要：
Recent findings showed that users on Facebook tend to select information that adhere to their system of beliefs and to form polarized groups -- i.e., echo chambers. Such a tendency dominates information cascades and might affect public debates on social relevant issues. In this work we explore the structural evolution of communities of interest by accounting for users emotions and engagement. Focusing on the Facebook pages reporting on scientific and conspiracy content, we characterize the evolution of the size of the two communities by fitting daily resolution data with three growth models -- i.e. the Gompertz model, the Logistic model, and the Log-logistic model. Then, we explore the interplay between emotional state and engagement of users in the group dynamics. Our findings show that communities' emotional behavior is affected by the users' involvement inside the echo chamber. Indeed, to an higher involvement corresponds a more negative approach. Moreover, we observe that, on average, more active users show a faster shift towards the negativity than less active ones.
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