ActivityPub

Testing This category serves to broadly discuss test practices that help increase Fediverse interoperability. Server to Server This protocol is used to distribute activities between actors on different servers, tying them into the same social graph. Client to Server This protocol permits a client to act on behalf of a user. E.g., a mobile app to interact with a social stream of the user’s actor. Threadiverse Working Group Social Web Task Force for Threaded Discussions on the Fediverse

Topic	Replies	Views	Activity
Guide for new ActivityPub implementers ActivityPub documentation , explanation This is an informal guide to help new implementers get up to speed with the ActivityPub specification (published as a W3C Recommendation) and how to build projects with ActivityPub support. :information_source: No…	47	113046	July 11, 2025
The ActivityPub Recommendation ActivityPub about	0	1090	September 12, 2019
FEP-1580: Move Actor Objects with a `migration` Collection ActivityPub fep	16	180	October 17, 2025
Quote Post Implementation Issues ActivityPub	2	107	September 29, 2025
Why does Mastodon.social send messages not addressed to me to my server? Server to Server	1	33	September 22, 2025
Fediverse, ActivityPub and the Ethics ActivityPub	6	97	September 18, 2025
Can we add a generated JSON list of FEPs to the repo? ActivityPub fep	16	131	August 28, 2025
Fediverse Relays ActivityPub	52	914	August 26, 2025
How and when to update Actor objects? Server to Server	2	23	August 23, 2025
Potential security vulnerability: Remote JSON-LD contexts may be used to bypass restrictions when arbitrary objects are allowed to be created ActivityPub	22	254	August 21, 2025
Agenda Prep for August 2025 ForumWG Meeting Threadiverse Working Group	5	36	August 14, 2025
Would there be any interest in a "pre-authorized fetch" FEP? ActivityPub	2	93	August 14, 2025
FEP-4f05: Soft Deletion ActivityPub draft , fep	7	84	August 13, 2025
FEP-c313: Replies Addressed to Original Author’s Followers ActivityPub	21	80	August 12, 2025
Notes no longer delivered on Mastodon Server to Server	3	38	July 30, 2025
Replacing HTTP Signatures with Bearer tokens (or OCaps)? ActivityPub	0	32	July 24, 2025
Liberating clients from servers, without throwing out baby with bathwater Client to Server	24	206	July 23, 2025
Nomadic identity for the fediverse? ActivityPub	95	9879	July 20, 2025
Events Interoperability: Validation, minimum requirements, common extensions ActivityPub	26	597	July 14, 2025
ActivityPub Client API: A Way Forward Client to Server	3	67	July 7, 2025
Thoughts on ActivityPub + Dating apps Server to Server	7	163	July 3, 2025
ForumWG cancelled this month (July) Threadiverse Working Group	0	11	July 3, 2025
ATProto gets PDS ActivityPub support ActivityPub fediverse	8	179	July 1, 2025
Help debugging why mastodon isn't finding an actor Testing	16	208	June 22, 2025
Threaded Conversations with Posts from Other Protocols, SSO Posting, and Unauthenticated Sources Server to Server	0	30	June 7, 2025
ForumWG canceled this month (June) Threadiverse Working Group	0	15	June 3, 2025
Changeable usernames? Server to Server	63	5704	June 3, 2025
Wiki: Collected feedback on interop testing, methods, living docs and specs Testing testing , wiki :point_right: This is a wiki post and anyone is encouraged to Edit and add additional sources. ActivityPub Test Suite Needs “Status of a robust ActivityPub test suite?” on SocialHub by Tim Chambers (@tchambers). …	0	3330	September 1, 2023
Who should I send Delete activities to? Server to Server	15	105	May 24, 2025
Addressing confusion between `Create` and contained object Server to Server	10	69	May 24, 2025