<http://schema.org/topics>
"cat video,cirque de soleil,Memes,mice,michael jordan,muhammad ali,Uncategorized,Video,Videos,Watercooler,Viral Video Recap,viral video,YouTube"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2013/12/14/viral-video-recap-cat-tree/>