<http://schema.org/description>
"Hashtags have become a popular way for participating in conversations on platforms such as Twitter.  In fact, Google's own Chris Messina is known for making them popular on the service. ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/google/2012/01/17/google-makes-it-easier-to-participate-with-auto-complete-for-hashtags/>