<http://schema.org/description>
"Way back in April of 2010 the Library of Congress and Twitter signed an agreement that provided the institution with all public tweets from 2006 through April of 2010. Today, the LoC ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/twitter/2013/01/04/library-of-congress-will-complete-twitter-archive-through-2010-this-month-now-has-170b-tweets-on-file/>