<http://schema.org/image>
<http://rack.0.mshcdn.com/media/ZgkyMDEyLzEyLzA0L2JhL2ZhY2Vib29rbGlrLmIwWS5qcGcKcAl0aHVtYgkxMjAweDYyNyMKZQlqcGc/040310e1/f70/facebook-likes-more-profitable-than-tweets-study--83f856a2d3.jpg>
<http://mashable.com/2011/03/16/facebook-like-worth/>