Social media platforms have enabled extremists to organize violent events, such as the 2021 U.S. Capitol Attack. Simultaneously, these platforms enable professional investigators and amateur sleuths to collaboratively collect and identify imagery of suspects with the goal of holding them accountable for their actions. Through a case study of Sedition Hunters, a Twitter community whose goal is to identify individuals who participated in the 2021 U.S. Capitol Attack, we explore what are the main topics or targets of the community, who participates in the community, and how. Using topic modeling, we find that information sharing is the main focus of the community. We also note an increase in awareness of privacy concerns. Furthermore, using social network analysis, we show how some participants played important roles in the community. Finally, we discuss implications for the content and structure of online crowdsourced investigations.

翻译：社交媒体平台既使极端分子能够组织诸如2021年美国国会山暴乱等暴力事件，也使专业调查人员与业余侦探得以协作收集并识别嫌疑人图像，旨在追究其行为责任。通过对Sedition Hunters（一个旨在识别参与2021年美国国会山暴乱个体的推特社群）的案例研究，我们探究该社群的主要议题或目标为何、参与者构成及其参与方式。运用主题建模，我们发现信息共享是社群的核心关注点，同时注意到隐私关切意识的提升。此外，通过社交网络分析，我们揭示了部分参与者在社群中扮演的关键角色。最后，我们讨论了这些发现对在线众包调查内容与结构的启示。