Amelia, would you mind considering getting rid of them? It's really a horribly crude and ineffective tool for moderating potentially sensitive subjects. Even if someone doesn't just use another word, or abbreviates or misspells it, it never stops the subject being discussed or the meaning being conveyed - it just makes whole discussions into comically unintelligible games of "Guess Which Controversial Word Fits The _____ !".
And do we really want to stop the related subjects being discussed? I mean, that doesn't make them less sensitive - moreso, probably, even - and it just conveys the point to us that we're assumed to be too immature or stupid to discuss them 'correctly', which I'm sure isn't your intention. So far, and to your credit, I've seen little enforcement of these presumably banned subjects beyond the automated antics of the word filter - but that just makes the whole thing seem more redundant.
One instance I can see it being vaguely useful is if you wanted to stop people whoring links to their <hugely popular online networking site and contemporary pop culture phenominon> profiles to get people to friend them (can't imagine this crowd being too horrible with it though), but in that case I think it'd be better achieved by including the .com bit so that we wouldn't have to deal with the silly strings of asterisks when the site name drops in general conversation.
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