<http://schema.org/topics>
"battles,faceoff,htc evo,iPhone,iPhone 4,Mobile,poll,polls,web faceoff,web-faceoff-miniseries"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/06/08/htc-evo-4g-vs-iphone-4/>