r-labs » Wiki Extensions

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Would it be possible (and do think that it is a good Idea) to create 
something like a "reputation system" for the wiki. I personally think it
is hard to keep the content of a wiki up to date. So it might be a good
idea to let people vote whether an article was useful or not if it needs
refactoring or if it should be deleted. Then someone who manages the wiki
could have a special view where he can see how many times a site was 
viewed & whether people who accessed it think it is useful. Articles that
are not looked at a lot might not be at the right place or have no links
to it or maybe the content is out of date.
I guess http://stackoverflow.com/ has this realized by enabling users to 
upvote & downvote questions.