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	115616	July 11, 2025
The ActivityPub Recommendation ActivityPub about	0	1093	September 12, 2019
FEP-ee3a: Exif metadata support ActivityPub fep	0	17	January 14, 2026
Service Capability Discovery Server to Server interop , server	9	806	January 12, 2026
RFC 9421 HTTP signatures in 2026 Server to Server	9	54	January 8, 2026
Events Interoperability: Validation, minimum requirements, common extensions ActivityPub	35	713	December 31, 2025
Pre-FEP: Evolving OrderedCollection to be more useful ActivityPub	1	97	December 31, 2025
FEP-4f05: Soft Deletion ActivityPub draft , fep	12	129	December 19, 2025
Webfinger for non-actor objects and storing foreign objects Server to Server server	3	36	December 17, 2025
FEP-1580: Move Actor Objects with a `migration` Collection ActivityPub fep	22	333	November 18, 2025
FEP-d8c8: BitTorrent `Torrent` objects ActivityPub fep	11	188	November 9, 2025
FEP-19b3: Specifying Properties of a Service ActivityPub	0	23	November 4, 2025
Generate sharelinks ActivityPub	1	25	November 3, 2025
Pre-FEP: Reassigning Actor and CoAuthor Representation for Federated CMS ActivityPub draft	4	58	November 3, 2025
Possible C2S Implementation in LAUTI Client to Server	0	20	October 22, 2025
Quote Post Implementation Issues ActivityPub	2	128	September 29, 2025
Why does Mastodon.social send messages not addressed to me to my server? Server to Server	1	53	September 22, 2025
Fediverse, ActivityPub and the Ethics ActivityPub	5	104	September 18, 2025
Can we add a generated JSON list of FEPs to the repo? ActivityPub fep	16	132	August 28, 2025
Fediverse Relays ActivityPub	52	1132	August 26, 2025
How and when to update Actor objects? Server to Server	2	35	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	287	August 21, 2025
Agenda Prep for August 2025 ForumWG Meeting Threadiverse Working Group	5	40	August 14, 2025
Would there be any interest in a "pre-authorized fetch" FEP? ActivityPub	2	105	August 14, 2025
FEP-c313: Replies Addressed to Original Author’s Followers ActivityPub	21	99	August 12, 2025
Notes no longer delivered on Mastodon Server to Server	3	51	July 30, 2025
Replacing HTTP Signatures with Bearer tokens (or OCaps)? ActivityPub	0	37	July 24, 2025
Liberating clients from servers, without throwing out baby with bathwater Client to Server	24	283	July 23, 2025
Nomadic identity for the fediverse? ActivityPub	95	9943	July 20, 2025
ActivityPub Client API: A Way Forward Client to Server	1	88	July 6, 2025