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My line of thinking has been that if votes are used to sort comments, then there is an advantage to them be sorted by only a positive signal rather than both positive and negative signals. It's just a hunch, but my hypothesis is that enabling an instant negative response biases the atmosphere towards a less-civil type of interaction. b_b is right that Hubski hasn't been put to the test of scale that a site like Reddit has. However, its my hope that the follow/share type of propogation enhances the famliarity that users have with those that share similar interests. Hopefully this breeds more civility too.