Activity Streams 2.0



 Activity Streams 2.0  is (AKA Activity Streams Core ) an open web standard (W3C Recommendation) and format for communicating a series of user activities across websites, based on prior ActivityStreams community proposals & specifications and developed in the W3C Social Web Working Group.


 * Latest published version: https://www.w3.org/TR/activitystreams-core/
 * Latest draft: https://w3c.github.io/activitystreams/core/

Software Support

 * Mastodon
 * granary

Service Support

 * Bridgy
 * Bridgy Fed
 * granary
 * various Mastodon instances

Extensions

 * AS2 extensions wiki page: https://www.w3.org/wiki/Activity_Streams_extensions

Criticism

 * Unspecified semantics leads to de facto semantics definition by largest implementation(s): https://hachyderm.io/@danderson/109459311884227844
 * "Every time the activitystreams core and vocab spec say "we left the semantics of these bytes completely unspecified on purpose", I die a little inside. In practice this seems to mean "today's most popular implementation owns the semantics, and shouldn't feel obligated to document them" :(" @danderson December 5, 2022
 * ^ https://hachyderm.io/@ewenmcneill@cloudisland.nz/109459750261035043