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FeatherPub is an implementation of ActivityPub aimed at solving several problems with the Recommendation.

Debate about AP shared inbox and how it should be defined and implemented.

Discussion about shared inbox, replies, json-ld, etc.

This specification describes SciFed, a standard for federation of scientific activities and content using ActivityPub.

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.

A little misleading since it doesn't actually list any errors (and they are there), but it's where they will go. There is also a link to the proposed errata.

This page exists to document extensions to the ActivityPub protocol. Extensions are developed as part of the SWICG.

This is an interesting document from a historical perspective. A lot changed between this first public draft and the final specification.