Use FOAF to crawl profiles
FriendFeed and Google Profiles both crawl FOAF and expose them: http://xmlns.com/foaf/spec/
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Ben Godfrey commented
Although rare, FOAF profiles provide a wealth of information. FOAF can be auto-discovered via <link title="FOAF"> in a page header. FOAF can be found embedded in some social network profiles. It would be a case of crawling all sites associated with a user to find all FOAF triples.