If you have a Facebook account, Facebook has given you an email address in the approximate format: 123456@facebook.com.
Today, they made that the default email address shown in your profile, if you show an email address in your profile, for everyone.
More info here:
Facebook Changed Everyone's Email to @Facebook.com; Here's How to Fix It
Today, they made that the default email address shown in your profile, if you show an email address in your profile, for everyone.
More info here:
Facebook Changed Everyone's Email to @Facebook.com; Here's How to Fix It