<http://schema.org/topics>
"ComScore,Mashable,microblogging,MySpace,news,pageviews,Social Media,social networking,traffic,Twitter,unique visitors,Uniques,visitors,web"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/09/28/twitter-now-getting-more-traffic-than-myspace/>