Something's been on my mind a bit lately. We've had a not-insignificant quantity of community-made puzzles that use specific users as part of the puzzles. Is this an issue that needs handling?
I know I, personally, have come up a couple times in puzzles. Here's a short list of links, which does exclude a fair number of questions: Emrakul, Doorknob, Kevin, d'alar'cop, Doorknob, Doorknob, Joe, d'alar'cop, warspyking, Michael, Oblongamous, avigrail, Gilles.
It makes me personally uncomfortable to find that I'm being referenced in a puzzle without my foreknowledge and consent, and I'd personally appreciate it if people didn't use me in puzzles without asking first. However, I'm wondering if this should be a more general site policy.
Is using specific users in puzzles a behaviour we find acceptable, and if not, what action should we take?