It says there is an existing account associated with the contact email address that I am trying to add.

The contact email address you are trying to add to your account is already associated with another Facebook account. Please note that you can only have one Facebook account per email address. If you proceed to add the new email address, then the original Facebook account associated with that email address will be removed from the site. If you believe you are receiving this message in error, please click here.

It says there is an existing account associated with my email address.

Please click here to request a new password for your account.

If you are not the account owner and are attempting to sign up for an account, then please be aware that you can only sign up for one Facebook account per email address. Email addresses are offered for free by many websites (e.g., Yahoo!, Gmail). If you believe you are receiving this message in error then please click here.

I tried to use the Friend Finder, but it says I have an unsupported email.

At this time, the Friend Finder is capable of looking directly at email address books for certain email domains (e.g., @hotmail.com). If the error message, "Unsupported Email Address" appears, then this feature cannot automatically look at the address book of your email address to find your friends.

However, you can still use this feature if your email client (the program you use to read your email) allows you to export your contacts list as a .csv, .vcf, or .txt file. Uploading this file to Facebook will allow us to use it to tell you which of your contacts are on the site. For more detailed instructions on how to do this with specific clients, please see the bottom of the Friend Finder page.

In the future, we hope to expand the feature's capabilities to serve the needs of a wider range of users. In the meantime, please feel free

I received an account creation email, but I'm already registered.

If you have received a Facebook account confirmation email in error, it's likely that someone has mistakenly attempted to register using your email address. As long as you do not click the link contained in the email, no action will be taken, and no account will be created.

It says my email address is invalid.

Unfortunately we do not support email addresses with generic prefixes (e.g. info@, webmaster@ etc.). Since email addresses of this nature are typically used for organizations and businesses, we do not allow them to be used for personal Facebook accounts. You will need to use a personal email address that does not contain this type of prefix. There are no exceptions to this rule.