<http://schema.org/description>
"Facebook is testing a new blue Like button. Users have spotted it showing up on the Web, but not on the social network, which suggests the potential change would only be affecting the ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/facebook/2013/10/19/facebook-tests-new-blue-like-button-web/>