The landscape of information has experienced significant transformations with the rapid expansion of the internet and the emergence of online social networks. Initially, there was optimism that these platforms would encourage a culture of active participation and diverse communication. However, recent events have brought to light the negative effects of social media platforms, leading to the creation of echo chambers, where users are exposed only to content that aligns with their existing beliefs. Furthermore, malicious individuals exploit these platforms to deceive people and undermine democratic processes. To gain a deeper understanding of these phenomena, this chapter introduces a computational method designed to identify coordinated inauthentic behavior within Facebook groups. The method focuses on analyzing posts, URLs, and images, revealing that certain Facebook groups engage in orchestrated campaigns. These groups simultaneously share identical content, which may expose users to repeated encounters with false or misleading narratives, effectively forming "disinformation echo chambers." This chapter concludes by discussing the theoretical and empirical implications of these findings.

翻译：随着互联网的快速扩张和在线社交网络的出现，信息格局经历了重大变革。最初，人们乐观地认为这些平台将鼓励积极参与和多样化交流的文化。然而，近期事件揭示了社交媒体平台的负面影响，导致出现了回音室，用户仅能接触到符合其既有信念的内容。此外，恶意行为者利用这些平台欺骗民众、破坏民主进程。为了更深入地理解这些现象，本章介绍了一种计算方法，旨在识别Facebook群组中的协调性不诚实行为。该方法聚焦于分析帖子、URL和图片，揭示出某些Facebook群组参与了有组织的宣传活动。这些群组同时分享相同内容，这可能导致用户反复接触虚假或误导性叙述，从而有效形成"虚假信息回音室"。本章最后讨论了这些发现在理论和实证方面的意义。