“This document presents a base set of Object types and Verbs for use with Atom Activity Extensions.”
#ActivityStreams
Atom Media Extensions
“This document presents an extension to the Atom Syndication Format that defines how media objects such as photos and videos might be represented in Atom and allows additional metadata to be published about linked media representations.”
Ident Engine
“Without much conscious thought, most of us have built identities across the web. We’ve filled in profiles, uploaded photos, videos, reviews and bookmarks. The Ident Engine uses semantic web API’s to bring together these web footprints.”