<http://schema.org/topics>
"Facebook,Foursquare,gowalla,location lists,Mashable,pete cashmore,Social Media,social networking,SXSW 2015,Twitter"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/03/15/pete-cashmore-time-sxsw-2010/>