<http://schema.org/description>
"Twitter is pretty simple, but it started out even simpler. The 140-character messaging service launched on March 21, 2006 with no way to send a reply or retweet someone. And it certainly didn't have hashtags. Those peculiar conventions, which make Twitter both irresistible and confounding today, were invented by its users. After a while, the..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://qz.com/135149/the-first-ever-hashtag-reply-and-retweet-as-twitter-users-invented-them/>