<http://schema.org/image>
<http://cdn1.tnwcdn.com/wp-content/blogs.dir/1/files/2011/07/Screen-shot-2011-07-13-at-11.05.13-AM.png>
<http://thenextweb.com/google/2010/07/03/android-vs-iphone-4-signal-strength-a-graphic-explanation/>