<http://schema.org/topics>
"chatroulette,Facebook,features,Foursquare,Lists,lolcats,Music,Music Lists,music videos,parodies,parody,pop culture,Social Media,social networking,spoof,spoofs,Twitter,Video,Video Lists,Videos,viral video,YouTube"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/08/12/social-media-songs/>