<http://schema.org/topics>
"Apple,Business,digg,Facebook,First to Know,Google,mark zuckerberg,Mobile,New Digg,news,Nokia,Social Media,sony,sony ericcson,Symbian,Tech"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/09/25/digg-traffic-sony-symbian/>