Remind your FB users about alternative auth methods

It’s too early to say anything about it and I dont want to share any opinion about what is happening with FB. We know it’s not going anywhere but still some users are considering to #DeleteFacebook. If you’re running an online business and you have users authenticating via FB. Probably you want to remind them about alternative authentication methods. Because of all activities around #DeleteFacebook, perhaps some of your users are going to delete their accounts and perhaps you don’t want to lose them. (Yes! FB has recover option.., but you still want to support your users properly)