<http://schema.org/description>
"Facebook today announced plans to clean up the News Feed by reducing stories that users are reporting as spammy or simply that they don't want to see. This update targets three broad ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/facebook/2014/04/10/facebook-cleans-news-feed-reducing-like-baiting-posts-repeated-content-spammy-links/>