How do I integrate Facebook profile and friend info

Hi Yall,

I think we all know what i mean when i say:

Is it possible to let people log in by Facebook and actually fetch their info? Like the most apps now ( e-mail, name, friends etc ).

I want to be able to let people log in and do something with their friends. Like sending a game request if they also play the game etc.

As far as i found out you can only share a message and stuff like that.

Is this the limitation or am i missing something important?

Thanks in advance for your help and information.