<http://schema.org/topics>
"Celebrities,Facebook,Gadgets,Gaming,Google,Marketing,Mashable Follow,Memes,Mobile,Music,Photography,Social Media,Sports,trending,Television,Twitter,Uncategorized,Video,Videos,Watercooler,viral video,YouTube"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2012/06/01/top-stories-may/>