Good on ya, maybejane!

I deleted mine back in 2009 because I never used it and had only one "friend" in it, but a couple of years later I've got a "welcome back" e-mail from FB, and a message saying that my e-mail had been successfuly changed.

I thought: "Welcome back? Hang on, I deleted that thing!".

Turns out someone with the same name as me (or probably someone trying to hack into my old account) was trying to reactivate that account for use.

I then immediately contacted FB and they in turn rolled it all back to my e-mail address and gave me back control of my now re-activated account.

And to this day, I still get FB e-mails sometimes saying "sorry you are having trouble logging in" when I don't even log in anymore, which means some identity thief out there is still trying...

I now just keep it activated for the sake of avoiding another account hijack attempt.

But do I use it? Never. And for the same reasons you already mentioned.