ActivityPub

ActivityPub is an open, decentralized social networking protocol [...]. It provides a client/server API for creating, updating, and deleting content, as well as a federated server-to-server API for delivering notifications and content.

• ActivityPub
• Activity Streams 2.0
• Activity Vocabulary
• JSON-LD (see JSON-LD for more information)

• History
• Tools
• Overview of the protocol, how to talk