<http://schema.org/topics>
"cardstar,Facebook,features,Foursquare,GetGlue,group buying,groupon,grouptabs,key ring,Lists,loyalty program,miso,opinion,PHILO,quora,scvngr,shopkick,Social Media,trending,tunerfish,tv.com relay"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/08/20/top-5-social-media-trends/>