<http://schema.org/thumbnailUrl>
<http://cdn1.tnwcdn.com/wp-content/blogs.dir/1/files/2011/10/4422453145_da979787e1_z-520x245.jpg>
<http://thenextweb.com/twitter/2011/10/26/twitter-provides-more-context-for-tweets-on-your-timeline/>