<http://schema.org/image>
<http://rack.3.mshcdn.com/media/ZgkyMDEzLzA3LzI1LzE3L1R1bWJscmNhbXBhLjM5NzE2LmpwZwpwCXRodW1iCTEyMDB4NjI3IwplCWpwZw/16f3043f/872/Tumblr-campaign.jpg>
<http://mashable.com/2013/07/25/how-to-tumblr-campaign/>