<http://schema.org/description>
"Hasttags are pretty cool but they also leave your company open to serious bad PR with Twitter. You cannot control who uses your hashtags good or bad. If someone wants to spam your hashtags when you're trying to use it, there's nothing you can do. I've done several Twitter chats with a hastag as well and anyone can come into that as they wish. thankfully I've seen no issues yet but ti's possible."^^<http://www.w3.org/2001/XMLSchema#string>
<http://famousbloggers.net/twitter-hashtags.html>