<http://schema.org/image>
<http://rack.3.mshcdn.com/media/ZgkyMDEyLzEyLzA0LzNhL3dpa2lwZWRpYWJsLmMzci5qcGcKcAl0aHVtYgkxMjAweDYyNyMKZQlqcGc/33a8e599/24d/wikipedia-blackout-survive-with-these-12-alternatives-fa29cb11c6.jpg>
<http://mashable.com/2012/01/17/wikipedia-alternatives/>