<http://schema.org/topics>
"Apple,app store (iOS) ,Business,First to Know,Foursquare,UK,Mashable,news,social games,Social Media,unoh,Zynga"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/08/06/zynga-unoh-foursquare-apple/>