<http://schema.org/thumbnailUrl>
<http://cdn1.tnwcdn.com/wp-content/blogs.dir/1/files/2011/12/balloons-520x245.jpg>
<http://thenextweb.com/twitter/2011/12/29/hp-is-sending-your-twitter-wishes-for-2012-into-the-air-on-floating-balloons/>