My experience of political Facebook groups has been a combination of mass hysteria (everyone joins) and then no action (all I see is people joining, and then later, leaving). There is more to Web 2.0 politics though, and the academic community is starting to get to grips with studying its implications.
Earlier this month, the Royal Holloway University ran an international conference on Politics Web 2.0. You can read some live blogging by Michah Sifrey at PoliticsWeb2.0: On the Future of Government in the Digital Era on Techweb, and follow a few links from there to get an idea of what was talked about.
One of my favourite academic bloggers – Ulises Mejias (aka i d e a n t) – attended. He looks at the theoretical issues and notes some themes that interested him on his blog here Politics and the web and here: Social Networks and the Politics of Nodocentrism
I don’t have time to think it through right now, but is is the time to be considering (for example) whether
the emphasis on speed that these technologies introduce might be detrimental to the emergence and enactment of political will
I wonder if the real action comes from the interactions between the authors of (owned) blogs, not vague, easy to join networks on Facebook, MySpace.