<http://schema.org/topics>
"Amazon Cloud Drive,Apps and Software,Box,box.net,cloud storage,Dropbox,features,gallery,Google Drive,iCloud,SkyDrive,Tech,Trending Small Bottom,Uncategorized"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2012/04/24/google-drive-compared/>