I would choose facebooker. Development of rfacebook is dead, even the previous maintainer suggests using facebooker. You'll find for most of it they're really similar, provide you with similar functionality, one's in current development and one's dead, you pick :).
I have a few applications up using rfacebook and won't change though (it's too much effort), though all new project's I start (for work of course) will be with facebooker.
And whatever you do, please, for the love of god, stay away from Facetime (some obscure library that some people used to develop an app I'm currently maintaining).
I have a few applications up using rfacebook and won't change though (it's too much effort), though all new project's I start (for work of course) will be with facebooker.