I want to force users to sign up with Google, and reject users who signed up with email.
First off, is there a way to disable email sign up, only providing Google??
Or the other option, identifying the source of the registration to do email verification for those who didn't use Google.
I'm trying to make a poll where users can only submit the form once, but I also only want real users to be able to fill out the form (which I can verify with Google), rather than anyone typing in random emails for random accounts.