<http://schema.org/topics>
"blogger,Facebook,features,Google,How To,linkedin,Lists,Mobile,mobile devices,news,opinion,pop culture,QR Codes,security,Social Good,Social Media,social networking,Tech,Twitter,Video"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2011/08/01/top-july-stories/>