Due to some new policies at Facebook, and the fact that I cannot find how to un-request permissions within their developer console,
I will be removing the option to "Login with Facebook" at some point soon.
If you are one of the few people who actually use this feature, you will be able to reset (or rather, set for the first time) your password using the
password recovery page. After this, you will be able to login with a username and password instead.
Do you use "Login with Facebook"? Is this an important feature? Comment below.