<http://schema.org/description>
"As Facebook ads evolve, the company continues to improve both its ad-targeting capabilities and its ad quality. This has been especially true in the last few months. Two changes in particular"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.aol.com/article/2013/06/12/facebook-dramatically-improves-their-ad-business/20620020/>