Specifications:
* **W3C Recommendations**: [JSON Activity Streams 2.0](http://www.w3.org/TR/activitystreams-core/) and [Activity Vocabulary](http://www.w3.org/TR/activitystreams-vocabulary/) (current [W3C Social WG](http://www.w3.org/Social/WG) publications)
* [JSON Activity Streams 1.0](http://activitystrea.ms/specs/json/1.0/) (2011)
* [Activity Base Schema](https://github.com/activitystreams/activity-schema/blob/master/activity-schema.md)
* [Audience Targeting for JSON Activity Streams](http://activitystrea.ms/specs/json/targeting/1.0/)
* [Responses for Activity Streams](http://activitystrea.ms/specs/json/replies/1.0/)
* [Draft: Verb Definitions for Activity Streams](https://raw.github.com/activitystreams/activity-streams-verb-definition/master/activity-streams-verb-definition.txt)
* [Draft: Priority Extension for Activity Streams](https://raw.github.com/jasnell/specs/master/activitystrea.ms/priority_extension.txt)
* [Atom Activity Streams 1.0](http://activitystrea.ms/specs/atom/1.0/)
Community:
* Join the [mailing list](http://groups.google.com/group/activity-streams/)
* Contribute to the [wiki](http://wiki.activitystrea.ms)
* [GitHub Repository](http://github.com/activitystreams "activitystreams's Profile - GitHub")
Archive: [Atom Media](http://martin.atkins.me.uk/specs/atommedia).
The Activity Streams format has already been adopted by BBC, [IBM](http://www.ibm.com), [Superfeedr](http://blog.superfeedr.com/activity/pubsubhubbub/streams/activity-streams/ "Superfeedr Blog : Activity Streams"), [TypePad](http://wiki.activitystrea.ms/TypePad-Activity-Streams), and [many others](http://wiki.activitystrea.ms/Implementors).
An initiative from the [Diso Project](http://diso-project.org). [Background](http://factoryjoe.com/blog/2008/12/20/where-were-going-with-activity-streams/).