registered user logging in

[flapjack]

what if the user who is already registered try to log in using this mod?
I'm assuming it will create additional account, but what's the story if the email is duplicated?

[SMFHacks]

If an already registered member logins into the system using social logins it will create a new account.

The system checks for duplicate usernames,emails and if so it throws the user an error message that they are already registered.

[flapjack]

do you know what information in particular it shares?
and whether is, or do you plan to add a screen to modify some of the settings, like username?

[SMFHacks]

The only information this mod gets is the firstname,lastname, email and that is just used to register/login the account. The user can modify their username/displayname inside SMF itself it is not tied that way but on member id.