what fidgety said sounds right.
Here is a quick tip - in the email, if there are any links that purport to be to FB, hover the cursor over the link. (Don't click on it). Then look down in the lower left gray area - it will tell you where the link really goes to. For instance, it may say www.facebook.com in the link that you are supposed to click on, but down on the bottom it will be different, like www.facebook.ng or some other weird address.
This will be true for any "phishing email".