<http://schema.org/description>
"Facebook revealed in its third quarter earnings report today that mobile ad revenue represented 49 percent of its $1.8 billion in overall advertising revenue. The news should reassure ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/facebook/2013/10/30/almost-half-facebooks-advertising-revenue-now-stems-mobile/>