<http://schema.org/topics>
"bicycle,biking,cycling,Health &amp; Fitness,geotagging,Lifestyle,Startups,Travel,Travel &amp; Leisure,Uncategorized"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2013/04/05/nyc-virtual-bike-ride-cyclodeo/>