<http://schema.org/topics>
"Business,Business Lists,news,contributor,customer engagement,earthkeepers,features,IBM,Lists,Mashable,Social Media,Social Network Lists,staples,timberland,Twitter,virgin america,web development"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/08/11/customer-engagement-style/>