[David Cushman] says TwittEr is for Group Forming. They may come together to solve a shared problem for a short period and then disband, often with overlaps, as they evolve toward the next purpose. And Twitter is exceptional at doing this - because of its architecture, because of the fuzzy-edge nature of the way groups form, reform and evolve. I'm not sure I buy that. I guess I agree it helps you form an AdHoc Creative Network from members of your Social Network. But is that a good filter (e.g. it's based more on people's level of involvement with TwittEr than their fit to the real problem).

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