I would like to have a game that allow player to play without signing in with facebook and let player link there facebook account anytime they want to. Our target user is ios and android device. By this what would you recommend the user to login with at the start. should I do it with (LoginWithAndroidDeviceID and LoginWithIOSDeviceID ) or (LoginWithCustomID). and then using LinkFacebookAccount when they want to link to the facebook account.
Thank in advance.