I've watched this talk from Seth Godin at least 10 times over the past few months. And every time I watch it I think about Twitter, and the incredible power that it provides to anyone on the planet to start, join or expand a Tribe they're passionate about. Take a few minutes and watch this video, and think about what's possible. @socialmedia411 is a small example. The untapped opportuntities out there for you and/or your organization are enormous.
Seth Godin on the Tribes We Lead http://www.ted.com/talks/seth_godin_on_the_tribes_we_lead.htmlThere's a lot more great TED talks at http://www.ted.com/