Login & Password | Facebook Help Center
https://www.facebook.com/help/217254398652760/
WebGo to . Click Email or Phone Number and enter one of the following: You can log in with any email that's listed on your Facebook account. If you have a mobile number confirmed on your account, you can enter it here (don't add any zeros before the country code, or any symbols). You can also log in with your username, if you set one up.
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