Don't you miss the days when the web really was the world's greatest decentralized network? Before everything got locked down into a handful of walled gardens? So do we.
Enter ActivityPub! ActivityPub is a decentralized social networking protocol based on the ActivityStreams 2.0 data format. ActivityPub is an official W3C recommended standard published by the W3C Social Web Working Group. It provides a client to server API for creating, updating and deleting content, as well as a federated server to server API for delivering notifications and subscribing to content.
Sounds exciting? Dive in!
==> Latest published version <==
==> Latest editor's draft <==
Or, are you a user looking for ActivityPub software to use? Check out this guide for ActivityPub users (community edited)!
We're so stoked to have you implementing ActivityPub! To make sure ActivityPub implementations work together, we have:
- Guide for new ActivityPub implementers: Community edited and unofficial, but useful!
Looking to discuss implementing ActivityPub? You can join the #social IRC channel on irc.w3.org! See also SocialHub, a community-run forum to discuss ActivityPub developments and ideas, and the Social CG, a W3C Community Group to continue the work of advancing the federated social web... including ActivityPub!
- Maintaining activitypub.rocks going forwardWed 03 September 2025
- Handing off activitypub.rocks to the ActivityPub communityThu 28 August 2025
- ActivityPub reaches W3C Recommendation status! Everybody party!Tue 20 March 2018
This site is maintained by the Web Task Force of the Social Community Group in the W3C, the current steward of the ActivityPub stack of standards.
To learn more about the SocialCG and how to participate, go to its home page.
To contribute to this website, come to a Task Force meeting (see SocialCG calendar) or submit an issue or pull request on Github.