<http://schema.org/description>
"Sometime last month, I noticed I started getting more emails from Twitter. Since I can't stand getting emails from social networking sites, and it's the start of a new month, I finally ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/twitter/2012/10/01/twitter-automatically-opted-email-notifications-heres-reduce-spam/>