<http://schema.org/image>
<http://cdn1.tnwcdn.com/wp-content/blogs.dir/1/files/2012/09/marcandreessen-zuckerberg-crop-2-520x245.jpg>
<http://thenextweb.com/shareables/2012/09/26/found-the-email-thread-marc-andreessen-proposed-img-html-tag/>