How to complaeatly get rid of Facebook on my iphone?

So my dad gave me his iPhone 4s when he got a new phone. I tryed signing in to something with my Facebook and it poped up as his Facebook profile, keep in mind that i signed out of his facebook on the app and signed him out of icloud and that has changed nothing.

Wipe it first - in settings to the erase option. Then its started over as your own, note that he will have to put in his icloud password (if iOS 7) before it can be wiped, but then it will be yours.

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