A. For Facebook-Login you just need to remove your Facebook App from the device (even Facebook Lite)!
NOTE: On some Emulators you cannot remove Facebook Lite, it will install automatically again. Install Luckypatcher and choose "freeze" App instead of remove.
B. You want to login with Google+ or Facebook-App (installed)?
1. Your device needs root! If you don't know what root is, your device is not rooted =D
2. You have to unsign APK (sometimes unsigned APKs are uploaded too, then you can skip this)
3. You must install original game and login with Google+ or FB (don't remove game after!)
4. You have to install the App Lucky Patcher
5. You have to patch the signature verification
6. You install the modded APK over the original game
7. Thats it =)
Sounds easy, but needs one time watched live to understand. So watch video and enjoy =)
Lucky Patcher Download:
C. There is now a way to install unsigned APKs without rooting your device by using a virtual machine on your Android named "VMOS". Learn here how to use it
-> How to install unsigned APK on non-root devices using VMOS app - platinmods.com - Android MODs | iOS MODs | Tutorials & More!