<http://schema.org/description>
"Twitter is reportedly in the process of testing two-factor authentication on its social network. According to Wired, the company is currently doing some internal testing before &amp;quot;incrementally ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/twitter/2013/04/24/twitter-two-factor-authentication/>