I've seen this on Ubiquity hardware as an option too. Apparently it requires you to "check-in" via facebook to use it, whatever that means exactly. There is also an option to login via facebook without this though.
How about no. Or hell no. If I see a request like that it is an immediate disconnect. Might as well have a requirement that they do a full anal cavity sweep before they can sell you a cup of coffee.
Terms of service had wording that made mining all data in your Facebook account sound like the intent.