<http://schema.org/description>
"Facebook is continuing to see more mobile usage of the social network. In its fourth quarter earnings report, the company shared that it has 680 million mobile active users, up 57 percent ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/facebook/2013/01/30/facebook-mobile-ad-revenue-q4-2013/>