<http://schema.org/topics>
"Business,Foursquare,geolocation,Marketing,mobile apps,Small Business,Startups,Uncategorized"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2012/07/18/foursquare-local-updates-merchants/?WT.mc_id=en_foursquare>