You may have not noticed it but Facebook changed your email address to firstname.lastname@example.org. It should be noted that they introduced their email service way back in 2010 but I think no one was/is using their address. Until lately when IT people noticed that emails found in the profile pages of FB users were automatically changed to @facebook.com!
But don't worry, Lifehacker is showing us how to change it. Here's how:
- Click "About" on your profile and scroll down to your email address. Click "Edit" to change them.
- Click on the circle next to your Facebook email address and change its setting to "Hidden From Timeline".
- Click on the circle next to your other email addresses and change their settings to "Shown On Timeline".
- Click the Save button at the bottom of the Edit popup (Don't forget this step).
More on this at this link: Facebook Changed Everyone’s Email to @Facebook.com; Here’s How to Fix Yours (Lifehacker)