<http://schema.org/url>
<http://thenextweb.com/insider/2010/12/21/instagram-expands-the-definition-of-a-check-in-with-the-help-of-foursquare-2/>
<http://thenextweb.com/insider/2010/12/21/instagram-expands-the-definition-of-a-check-in-with-the-help-of-foursquare-2/>