re: the discussion last night, the hashtag idea is fine as an ad-hoc way for the presenters to follow it but not ideal for lots of reasons. You might want to look at software like
http://cotweet.com/ or
http://hootsuite.com/, designed to allow teams to use Twitter effectively. You can set up different users with different permissions so, for example, you can make Tikay read-only if you don't want your stream filling up with train tweets.
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Thanks