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I assume that you are thinking of filtering based on new* or ass*. Not a good idea!
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Well thats up to the person doing the filtering.

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I think it would be counterproductive to separate users in public forums. Each set of users has a right to post questions and comments (like you have stated time and time again)...excluding someone based on lack of knowledge is not a very good idea.
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Same again, its up the the person doing the filtering (who may not think like you). If they want to ignore someone they'll do it anyway....adding filtering just means they won't have to see the posts.