ActivityPub

Server to Server This protocol is used to distribute activities between actors on different servers, tying them into the same social graph. Testing This category serves to broadly discuss test practices that help increase Fediverse interoperability. 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	107632	July 11, 2025
The ActivityPub Recommendation ActivityPub about	0	1079	September 12, 2019
SocialHub developer community: Reboot or Shutdown? ActivityPub community	35	210	July 31, 2025
Notes no longer delivered on Mastodon Server to Server	3	12	July 30, 2025
Am I understanding something wrong or is JSON-LD remote context support a gigantic security vulnerability if any "dumb" C2S server implementation tries to federate with the current network? ActivityPub	9	83	July 25, 2025
Replacing HTTP Signatures with Bearer tokens (or OCaps)? ActivityPub	0	15	July 24, 2025
Liberating clients from servers, without throwing out baby with bathwater Client to Server	24	150	July 23, 2025
Fediverse, ActivityPub and the Ethics ActivityPub	4	55	July 23, 2025
Nomadic identity for the fediverse? ActivityPub	95	9733	July 20, 2025
Events Interoperability: Validation, minimum requirements, common extensions ActivityPub	26	585	July 14, 2025
ActivityPub Client API: A Way Forward Client to Server	3	43	July 7, 2025
Thoughts on ActivityPub + Dating apps Server to Server	7	120	July 3, 2025
ForumWG cancelled this month (July) Threadiverse Working Group	0	8	July 3, 2025
ATProto gets PDS ActivityPub support ActivityPub fediverse	8	134	July 1, 2025
Help debugging why mastodon isn't finding an actor Testing	16	187	June 22, 2025
Threaded Conversations with Posts from Other Protocols, SSO Posting, and Unauthenticated Sources Server to Server	0	26	June 7, 2025
ForumWG canceled this month (June) Threadiverse Working Group	0	14	June 3, 2025
Changeable usernames? Server to Server	63	5661	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	3323	September 1, 2023
Who should I send Delete activities to? Server to Server	15	84	May 24, 2025
Addressing confusion between `Create` and contained object Server to Server	10	68	May 24, 2025
FEP-4f05: Soft Deletion ActivityPub draft , fep	4	53	May 5, 2025
Oneboxes and URI separators are not synchronised when federated Server to Server discourse	1	25	May 4, 2025
Exposing edit history via Activitystreams ActivityPub	5	420	April 29, 2025
Friendship and other non-follow relationships ActivityPub fep	9	60	April 18, 2025
The Block activity, how's that supposed to work? Server to Server	15	725	April 18, 2025
Agenda Prep for April 2025 WG Meeting Threadiverse Working Group	2	32	April 3, 2025
Moving topics Threadiverse Working Group	6	23	April 2, 2025
FEP Implementation Metadata ActivityPub fep	1	43	March 16, 2025
Fediverse Relays ActivityPub	46	750	March 13, 2025