How do you know if a certain email has a facebook account already?

[☂☂Jackie☂☂]

i want to make a REAL one and i've made a couple fake ones in the past when i was in 4th grade with some of my emails (i have like 10 email accounts). how can i know if an email already has a facebook account?

[Paco]

Go to the password reset page (https://login.facebook.com/reset.php). Type in one of the email accounts that you think might have an account. Try to get the password reset email. If it works and they send you a password reset email, then you know you've created an facebook account with that email address. If you get an error message that says "invalid email," then you know that you haven't used that email address on facebook yet.