WARNING! This URL (in the Main cluster) is no longer the authoritative source for this page; it has been moved to the VOS or ODS cluster as appropriate instead.
See Tim Haynes in case of confusion.
ODS Programmers Guide Social Graph
ODS Framework is a powerful system for managing user's profile and its applications.
Details for APIs about people and activities you can find here.
Use SPARQL to Query My Personal Profile & Social Network Data Spaces using the FOAF Ontology
Example of Google Social Graph RDF Cartridge you can find here.