https://www.w3.org/TR/activitypub/
The ActivityPub protocol is a decentralized social networking protocol based upon the ActivityStreams 2.0 data format.
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 content. It is used by [[Peer Tube]].
from https://git.feneas.org/feneas/fediverse/-/wikis/watchlist-for-activitypub-apps