<http://schema.org/url>
<http://thenextweb.com/apps/2011/02/10/pen-io-a-quick-simple-and-elegant-way-to-publish-text-on-the-web/>
<http://thenextweb.com/apps/2011/02/10/pen-io-a-quick-simple-and-elegant-way-to-publish-text-on-the-web/>