<http://schema.org/topics>
"Business,Business Lists,Celebrities,Facebook,features,Gaming,Google,Lady Gaga,Lists,mainstream,Marketing,mobile apps,Music,Music Lists,pop culture,Social Media,social networking,trending,Twitter,Video,web,YouTube"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2011/05/24/lady-gaga-case-study/>