ActivityPub

About

ActivityPub (AP) is an internet federation protocol. It became the primary federation protocol for Mastodon starting with approximately version 2, which previously had been based on OStatus.

AP became a W3C recommendation on 2018-01-23, due in large part to the popularity of Mastodon.

Software

These primarily use AP:

• GoToSocial
• Mastodon
• Pleroma
• Akkoma

These support AP but primarily use another federation protocol:

• Hubzilla is based on the Zot protocol

To check: Friendica might support AP.

Links

Reference

• Wikipedia (article created 2017-08-18)
• W3C
• ActivityPub.rocks - sort of a publicity site

History

• 2022-11-08 Christine Lemmer-Webber on octodon.social: «A lot of people contributed to ActivityPub, but I'm going to give a breakdown of the authors and what they did:»

Commentary

• 2022-11-24 weirder.earth/@noracodes «it's great to see that we have so many ActivityPub server implementations in different languages/ecosystems:» A short list follows; discussion in thread.
• 2018-06-23 How to implement a basic ActivityPub server by Eugen Rochko
• 2017-08-11 A lot of folks have rightly questioned why I'm so hot and cold on ActivityPub.

Code

• Kroeg, an ActivityPub server written in C#
• landrok/ActivityPub: ActivityPub library in PHP