<http://schema.org/topics>
"activision,DC Shoes,features,Friskies,Google,Lady Gaga,Lists,Marvel,Monthly Viral Ads,red bull,Video,viral video,volkswagen,YouTube"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2011/06/03/most-shared-video-ads-may/>