<http://schema.org/description>
"Facebook began a gradual rollout of promoted posts for brand pages about a week ago and the social networking site has now posted its first demo video today, letting advertisers know ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/socialmedia/2012/05/30/facebook-wants-page-administrators-to-promote-their-posts-and-this-demo-video-shows-them-how/>