What is Federation, What is ActivityPub?

Tŵt Cymru operates a range of communications services that use an open, decentralised social networking protocol called “ActivityPub”. ActivityPub provides a method for software services to enable creating, updating, and deleting content, as well as delivering notifications and content.

The Fediverse is the collection of social networks and applications that can communicate with each other using ActivityPub, while remaining independent. Users on different communities, social networks and apps can send and receive updates across the network, creating an open, social web.