flutter - How to get access to the firebase Authentication part

Question

In my app I've 2 login methods(google&facebook) and all the users appear in the Authentication part inside my firebase project, and I haven't list/collection of my users in my database.

I want to display in my app list of users with some personal data.

My question is how do i get access to the users from the Authentication part(to get all the users for example)?

Is it good approach that the users appear only in the Authentication and not inside my database?

Answer 1

Waitting for answers