<http://schema.org/description>
"Facebook is more than just a social network, it is also officially an\u00A0online science laboratory. The company has revealed in a research paper that it carried out a week-long experiment ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/facebook/2014/06/28/facebook-manipulated-690000-users-news-feeds-run-psychology-experiment/>