Facebook replaced the email address users chose when they signed up with a facebook.com address. The Facebook email accounts allow users to communicate with outside email addresses via Facebook.
The changes were first pointed out by bloggers over the weekend, leading to complaints from users.
Users are free to restore their former email addresses. In an email, Facebook spokeswoman Jillian Stefanki said the site is also rolling out a setting that allows people to decide which email addresses to show on their pages.
The company said in a statement in April that it was "updating addresses on Facebook to make them consistent across our site."
Also on HuffPost