: When a profile is locked, only friends can see the full-size profile picture or cover photo.
If you genuinely need to see the person’s photo, send a request. Write a polite message explaining who you are. If they accept, you see the photo. If they deny, respect their privacy. facebook private profile picture viewer online
: They may ask for your own Facebook login to "verify" you, which allows them to hijack your account. : When a profile is locked, only friends