Facebook now allows 4 digit pin to register your new device

Whenever you log in to your Facebook account from a new device, you can now add a special 4 character pin.

This 4 character pin is required in addition to your password.





So, if you enabled log in alerts in Facebook and log in using a new device, you will now get an additional option to add a 4 digit pin.

4 digit Facebook pin

Facebook pin setup