<http://schema.org/topics>
"Advertising,digg,Facebook,facebook privacy,Google,hi5,LiveJournal,Marketing,MySpace,news,privacy,Social Media,social networking,trending,xanga,Yahoo"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/05/20/facebook-caught-sending-user-data-to-advertisers/>