<http://schema.org/topics>
"advertising lists,Business,Business Lists,features,GoPro,Lists,Marketing,orabrush,Pepto Bismol,Social Media,social media marketing,starbucks,Video,Video Lists,Wal-Mart,YouTube"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2011/05/11/top-branded-youtube-channels/>