Site Members Request: Allowing Members to Sign Up and Log In Without Using an Email Address

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Currently, when a visitor signs up or logs in as a member to your site, they enter an email address. It is not possible to let them sign up or log in using other identifying information such as a phone number or username.
Tip:
Your site visitors can sign up with social logins (e.g. Google or Facebook account) if they don't want to use an email address and password.
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