<http://schema.org/description>
"Whatever you think of Google+ so far, whether you've had a chance to try it yet or not, there's no doubt that one of the best things about it is the ability to create 'circles' of friends ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/facebook/2011/06/30/brilliant-create-facebook-friend-lists-the-google-way-with-circle-hack/>