<http://schema.org/image>
<http://rack.0.mshcdn.com/media/ZgkyMDEyLzEyLzA0L2U2L3Nob3VsZHlvdXJhLmJSai5qcGcKcAl0aHVtYgkxMjAweDYyNyMKZQlqcGc/cb3280b4/8b3/should-your-api-be-free-or-pay-to-play--a785d3cdc8.jpg>
<http://mashable.com/2011/04/21/free-or-paid-api/>