sign up for FB using an old e-mail address (or open a new one at yahoo.com or hotmail), give minimal info, and then use your new account for getting tickets. you don't have to use FB for anything else. think of it as one of those presale sites - you'll create an account on those, right? they ask you for more info than FB (like mailing address).
i know, i know, you're edgy, not one of the sheeple, one of the last free thinkers, etc. don't worry, we won't tell anyone.