To find a hidden profile, check the friends list of possible mutual friends.
Facebook's privacy settings can be a handy tool for keeping your information visible to the right people. For example, you can hide your profile from appearing under the results of a general name search. But privacy settings can also be an inconvenience -- for example, when you try to find someone who you know would accept your friend request. There is a way to bypass this obstacle and send a person with a hidden profile a friend request

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