<http://schema.org/image>
<http://rack.2.mshcdn.com/media/ZgkyMDEyLzEyLzA0L2IzL2JhcmFja29iYW1hLmJVbi5qcGcKcAl0aHVtYgkxMjAweDYyNyMKZQlqcGc/a21f1c17/59c/barack-obama-to-start-tweeting-from-barackobama-account-978a2ac1b0.jpg>
<http://mashable.com/2011/06/18/obama-tweets/>