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It's hard to say, because there are a lot of bot accounts. We have a number of measures in place to stop them from doing anything, and it's not nearly as bad as it used to be, but it does make it hard to say exactly how many legitimate users are signing up, so we're usually left to go on feel.
If necessary, I can run some more advanced reports that filter for posts and the like to try to get a better picture, but that's a bit more elaborate. My guess is that there's been a bit more in the way of new users, but that it's more about existing users posting more.