<http://schema.org/description>
"When Jon Wheatly launched his authority-based Twitter search mash-up, the tech blogosphere started discussing which factors determine one's authority on the microblogging service. Several ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/2009/01/19/theres-your-twitter-authority-list-retweetist/>