Meta has entered the Fediverse. This is their FAQ Guide for users interested in what it means. Note it branches off to many other areas as well.| Jeff's Bookmarks
| help.instagram.com
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.| www.w3.org