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Some forums have a feature where if a post is viewed as trolling or flamebait, any user can mod that post, and after that the posts text is smaller and it's color is adjusted to be similar to the background color. Other categories/actions could be added but generally i've found it succesfully used to dampen unwarranted thoughts. (successfully implemented at: http://sensibleerection.com NSFW)
http://slashdot.org/ has a similar policy where productive thoughts are expanded while everything else is closed until a user mods it as important or relevant.
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