Hello Toki,
That autogenerated username it’s the default facebook implementation way and the most used approach.
A second approach would be to add a step ( eventually a popup ) before the facebook registration, which will require the member to input the desired username, but this doesn’t actually match with the concept of facebook login, which is exactly to be as simple as it can be for the user.
You will need to understand that this solution is a custom work which requires programming skills and a dedicated amount of time. Thing that isn’t covered by our support conditions.
I’ll be pleased to help you if you have any more questions.
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