<http://schema.org/topics>
"Apps and Software,digg,HootSuite,inboxq,Marketing,Social Media,Startups,Trendspottr,Uncategorized"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2012/02/01/hootsuite-digg-inboxq-trendspottr/>