<http://schema.org/topics>
"Advertising,Business,contributor,Facebook,farmville,features,Gaming,How To,mall world,Mashable,poweRBrands,restaurant city,social,social games,sorority life,ultimate fan,Zynga"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/09/27/social-game-advertising/>