TY - GEN N1 - This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. TI - Exploring Content Moderation in the Decentralised Web: The Pleroma Case EP - 335 Y1 - 2021/12// AV - public SP - 328 KW - Content Moderation KW - Federation policies KW - Collateral damage A1 - Hassan, AI A1 - Raman, A A1 - Castro, I A1 - Zia, HB A1 - Cristofaro, ED A1 - Sastry, N A1 - Tyson, G ID - discovery10139706 N2 - Decentralising the Web is a desirable but challenging goal. One particular challenge is achieving decentralised content moderation in the face of various adversaries (e.g. trolls). To overcome this challenge, many Decentralised Web (DW) implementations rely on federation policies. Administrators use these policies to create rules that ban or modify content that matches specific rules. This, however, can have unintended consequences for many users. In this paper, we present the first study of federation policies on the DW, their in-the-wild usage, and their impact on users. We identify how these policies may negatively impact "innocent" users and outline possible solutions to avoid this problem in the future. UR - https://doi.org/10.1145/3485983.3494838 PB - Association for Computing Machinery (ACM) ER -