Answer 1
You created it, you should remember it.
Answer 2
If you have forgotten your password, click "Forgot Password" on the login screen. A confirmation and password reset instructions will be sent to the email address you registered for Facebook with.
This service is present in the settings of facebook page.
you can hack them
I forgot my facebook ID ,but i know the password and name .What can i do to find the ID again?
please, l want to know about that your Facebook
how can break my facebook password
I just want to know because i dont know how to get in to facebook.
i want to know others facebook pasword
That is private, you don't need to know that
You don't need to know any password except your own. To know the account names, contact your friends.
First facebook admin block your account for any reason. Second one of your friend know your password and mail address or you give to him for any kind of update. He/She changed your password.
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You can know the changed password on Gmail. There is a notification that the password has changed. However you cannot see the changed password.