First off, you're probably not going to have much success promoting something that requires the user to whip out their cc. Think about it, it's FB. Also, Facebook doesn't allow email/zip submits anymore - you can try cloaking but that can lead to getting your account banned.
As far as other offers go; dating, edu, etc. - it really all just depends on the offer. Test both ways out on multiple offers, and see what works.