<http://schema.org/description>
"Over the past few months, Twitter has made several major updates to photo sharing on its platform in hopes of countering the assumption that the service is used mostly for text. Now, ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/twitter/2014/05/08/twitter-posts-ultimate-guide-photo-sharing-convince-post-pics/>