<http://schema.org/description>
"If you've already implemented a Tweet button onto your site, then you're familiar with the fact that all you can really do with it is have it retweet an article and perhaps suggest ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/twitter/2011/03/31/twitter-just-unveiled-web-intents-heres-how-to-use-them/>