<http://schema.org/url>
<http://www.technologyreview.com/news/425483/google-invites-everyone-to-be-friends%E2%80%94on-its-social-network/>
<http://www.technologyreview.com/news/425483/google-invites-everyone-to-be-friends%E2%80%94on-its-social-network/>