If you can’t find a profile picture that looks like your old friend, chances are you either don’t recognize them or they have a different sort of profile picture on Facebook. Some people choose to make their profile picture a photo of animals, cars, cartoon characters, and other things they like. If you can’t tell, try clicking on some of the people’s Facebook profiles. While much of the information on their profile will probably be hidden, since you haven’t “friended” them – you may be able to uncover enough information to recognize the person you’re looking for.
If you find someone and think it may be them, but you aren’t sure, consider sending them a friend request anyways. Otherwise, send your Facebook friend a quick message asking if the person on their “Friends” list is the person you are looking for.