ActivityPub
More info
- Creator
- W3C Social Web Working Group
- Released
- Type
- Protocol
- Spec
- W3C Recommendation
- Wikipedia
- en.wikipedia.org
W3C-standardised protocol (2018) for federated social networks — every server talks to others by posting JSON-LD activities (Create, Follow, Like, Announce) to each other's inboxes.
Two core concepts: actors (users, groups, applications with a URI as identity) and activities (verbs describing what an actor does). The server-to-server protocol is HTTP POST + HTTP Signatures for authentication.
Powers Mastodon, Pleroma, PeerTube, Lemmy, Pixelfed, Misskey and now Threads (Meta, opt-in). Together they form the fediverse — today's largest decentralised social network.