ActivityPub is a protocol for decentralized [1.1][2.1] and federated [1.2][2.2] social networking [1.1][2.1].
ActivityPub is a decentralized social networking protocol […].
[ActivityPub] provides […] a federated server to server API for delivering notifications and subscribing to content.
The ActivityPub protocol is a decentralized social networking protocol […].
[ActivityPub] provides a […] federated server to server API for delivering notifications and content.