<http://schema.org/description>
"Mozilla and Facebook today announced the official launch of Facebook Messenger for Firefox. While the new addition became available last month  with the release of Firefox 17, Mozilla ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/apps/2012/12/03/mozilla-launches-facebook-messenger-for-firefox-lets-you-im-your-friends-from-anywhere-on-the-web/>