I'd say, "sorry, I don't have one", which is the truth.
I live in California and it is now illegal for a perspective employer to ask for my Facebook passwords or to view my pages during my interview.
I would tell them where they could stick the job?
If what dragonfly says is true though, then it's not legal to ask for that where I live, so it's moot anyway.
I don't got no Facebook account.
But if I had, I would have no objection. After all, what you put out there on the Web is in the public domain. If you don't want people to read it, why post it?
Actually, there would have been no problem, as I had to use FB sometimes for several professional contacts.
I don't Facebook. I'm an adult.
I'd say no thanks, and that they'd revealed themselves as company I wouldn't want to work for.
I might. I don't know how relevant it may be to the discussion but I don't post anything online that I wouldn't want people to know about me; I have nothing to hide.