<http://schema.org/topics>
"blogging,blogger,Blogging Lists,BLOGS,news,CSS,customize,features,html,Lists,Mashable,Media,Photography,posterous,Social Media,theme,themes,Update,Video,Web Apps,web design,web development,WordPress"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/08/08/great-posterous-themes/>