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Honestly, I find these message boards quite disturbing. I applaud them for providing opportunities to create bonding social capital, but many of the posts are quite negative and offensive, detracting from any social benefit they potentially create.
I have to ask if you have ever listened to right wing talk radio?
Or even better, have you ever visited a site such as Little Green Footballs, Red State or Free Republic?
Online discussions of damn near anything tend to get considerably more vituperative than equivalent face to face discussions.
But in my case at least, it is online discussions or nothing, there is no one I know in real life who is either interested in or willing to engage me in discussions on the subjects in which I'm interested, politics being just one of them.