I noticed a question the other day on SO which was tagged mozila.
This is obviously a typo (in fact, they spelled it correctly in the question itself), so I edited the question to correct it, but since they were a very low-rep user, I asked myself how they managed to create the tag at all.
Turns out they didn't create it -- there's a handful of other questions with the same mis-spelled tag.
So my question is: how do we get rid of an obviously wrong tag like this?
I considered going to each mozila question in turn and fixing the tag, but even for a relatively low number of questions that seemed like a bit of a drag. Plus it would mean they'd all suddenly appear on the front page, which is fine, except that some of them are quite old.
Also, I wasn't sure whether doing that would actually purge the tag from the database? Ideally, it wouldn't appear in the tag auto-complete any more, and another new user making the same typo would be unable to proceed.
If it's something I can do, then please tell me how. Otherwise, if it's something that needs moderator attention, then.... uh... consider yourselves notified. :-)
Oh, and by the way -- on the same topic, I notice that right here on Meta we have discussion (7384 questions) and discussions (1 question). Presumably that's another one that needs the same treatment. (and I definitely can't help here; I've still got quite low rep here on meta)