<http://schema.org/topics>
"Apps and Software,Celebrities,Entertainment,Mobile,mobile apps,Music,Postcard on the Run,Selena Gomez,Startups,Uncategorized"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2011/11/17/selena-gomez-investment-postcard-on-the-run/>