When you create an android application that integrates with Facebook, you need to tell Facebook what your application key is using the following statement:
keytool -exportcert -alias androiddebugkey \ -keystore ~/.android/debug.keystore | openssl sha1 -binary \ | openssl base64
Great. Unfortunately what I wasn't aware of was that if you use the wrong password when prompted, the keytool silently returns a garbage string that is NOT your key. Thanks to some quick research on stackOverflow and I found that the default password for the keystore is 'android'. Providing the correct key to Facebook allowed the plugin to correctly authorize me. Hopefully, this will be helpful to someone else!