May 23rd, 2017
The Social Web Working Group has published ActivityStreams 2.0 as a Recommendation. AS2 provides a JSON data model and vocabulary for representing common online social objects, activities, and the relationships between them. AS2 is anticipated to become the de-facto standard for sharing social data between disparate (perhaps decentralized) Social Web applications, and builds on the well-used ActivityStreams 1.0. The AS2 Vocabulary provides a core set of terms, which are extensible using JSON-LD, and extensions may be made stable by means of the Social Web Incubator Community Group. AS2 may be used as part of any protocol, but the Social Web Working Group is developing ActivityPub specifically for AS2-based client-to-server and server-to-server interactions.