Always double-check Facebook friend requests. Take a few moments to look over the profile and verify that account is a real person, not a scam. 

BBB Watch

Always double-check Facebook friend requests. Take a few moments to look over the profile and verify that account is a real person, not a scam. Scan your list of current Friends to see if any show up twice (the newer account is going to be the scam one). Report fake accounts to Facebook.

— BBB