ActivityPub

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 Server to Server This protocol is used to distribute activities between actors on different servers, tying them into the same social graph.

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…	50	128953	September 22, 2026
The ActivityPub Recommendation ActivityPub about	0	1128	September 12, 2019
FEP-2fa1: Federated Categories ActivityPub	8	78	November 6, 2026
FEP-5837: Content Credentials for Media Attachments ActivityPub	5	37	November 5, 2026
Using AP federation to re-unify fediverse dev discussion across multiple forums Client to Server	5	116	November 3, 2026
FEP-f12e: Consent-respecting attributions ActivityPub	2	57	October 30, 2026
Autonomous identity for the pluriverse based on OAuth/OIDC ActivityPub	28	3983	October 29, 2026
Boundaries between AP and AS2, and between AS2 and non-AS2 ActivityPub	15	307	October 27, 2026
Idea for a more capable relay server Server to Server	5	191	October 1, 2026
How to participate in the W3C Working Groups on AP ActivityPub	14	264	September 21, 2026
PortaFed: Cryptographic Account Portability for ActivityPub — FEP Draft for Review ActivityPub fep	1	78	September 10, 2026
FEP-633c: Guardians ActivityPub draft , fep	6	235	September 4, 2026
The ActivityPub API offers opportunity for a paradigm shift Client to Server server , client	1	83	September 3, 2026
RAR vocabulary ActivityPub	17	302	August 4, 2026
Federating real-time “rooms” (presence + live audio), not published objects…what am I missing? Server to Server protocol	6	109	July 22, 2026
RFC 9421 HTTP signatures in 2026 Server to Server	28	755	July 16, 2026
ActivityPub MLS - Message Ordering, Metadata, and Bears (Oh My!) ActivityPub	2	134	July 15, 2026
Partially embedded objects ActivityPub	18	258	July 12, 2026
Potential security vulnerability: Remote JSON-LD contexts may be used to bypass restrictions when arbitrary objects are allowed to be created ActivityPub	23	589	July 9, 2026
Weirdness in (mastodon) quote posts ActivityPub	2	55	April 22, 2026
Grassroots open standards for fediverse evolution ActivityPub best-practice	29	519	April 21, 2026
Events Interoperability: Validation, minimum requirements, common extensions ActivityPub	38	1004	March 23, 2026
implement account portability ActivityPub	0	44	March 22, 2026
Proposal: Explore page with filterable FEP table ActivityPub	7	98	March 22, 2026
FEP-2a62: signed account migration ActivityPub draft , fep	0	39	March 22, 2026
Loops ships federated Starter Kits ActivityPub	0	35	March 22, 2026
Fep-c07e: add product type to object ActivityPub draft , fep	12	172	March 18, 2026
ActivityPub API: Avoid Misconception Client to Server w3c , client	0	52	March 17, 2026
FEP-34c1: Collection Filtering using TREE Hypermedia Vocabulary ActivityPub	9	175	March 15, 2026
Replacing HTTP Signatures with Bearer tokens (or OCaps)? ActivityPub	5	153	March 14, 2026