FOAF is all about people
The FOAF ("Friend of a Friend") project is a community driven effort to define an RDF vocabulary for expressing metadata about people, and their interests, relationships and activities. Founded by Dan Brickley and Libby Miller, FOAF is an open, community-lead initiative which is tackling head-on the wider Semantic Web goal of creating a machine processable web of data.
Just like web pages, FOAF documents can be linked together to form a web of data, with well-defined semantics. Read the article
(xml.com). Read about FOAF