<http://schema.org/thumbnailUrl>
<http://cdn1.tnwcdn.com/wp-content/blogs.dir/1/files/2013/10/171479996-1-520x245.jpg>
<http://thenextweb.com/google/2014/08/20/google-now-offers-targeted-mobile-app-install-ads-search-youtube-deep-linking-installed-apps/>