<http://schema.org/description>
"Update: Twitter has informed us directly that the issue has been resolved.\r\n--\r\n\r\nUpdate:\u00A0We have heard back from Twitter and they said that they are looking into the situation.\r\n\r\n500px ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/insider/2013/02/23/500px-bemoans-twitter-link-blockade-claims-auto-generated-citations-about-malware-and-spam-are-false/>