<http://schema.org/description>
"Facebook today announced it has begun testing ads in third-party mobile apps. While the company says it has experimented similarly before, this test is different because it is working ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/facebook/2014/01/22/facebook-starts-testing-ads-mobile-apps-works-directly-advertisers-mobile-ad-network/>