<http://schema.org/image>
<http://rack.0.mshcdn.com/media/ZgkyMDEzLzA0LzE4LzhiL3BhaWRjb250ZW50LjU4YzJhLmpwZwpwCXRodW1iCTEyMDB4NjI3IwplCWpwZw/f0be9105/be8/paidcontent-david-karp-2.jpg>
<http://mashable.com/2013/04/17/users-stay-longer-on-tumblr-than-facebook/>