Is it possible to create a community / multi-user Twitter?

I'm thinking about what MTV did with the VMAs: http://twitter.com/vma

Is it possible for all Twitterers to do this, or was this a special thing done for MTV? What I want is for people with a common interest or at a common event to be able to send tweets about that interest/event to a community. So, if I'm a WGA member and I'm at a WGA rally, I can send a tweet to my personal Twitter about the rally, and have that tweet included on a communal WGA Twitter. And that communal WGA Twitter could be followed by everyone interested in WGA events -- so instead of having to find & follow multiple personal Twitters, with non-rally-related tweets mixed in, they could simply follow the communal WGA Twitter, to see all the WGA tweets (and only the WGA tweets) at once.

Is this a functionality that Twitter already has? If so, how do I do it? If not, is it something we'll be able to do in the future?
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