Facebook does not track who views your profile, and they explicitly state that they do not permit third-party apps to provide this functionality. When a profile is "locked," non-friends can only see a small, static version of the profile picture and a very limited amount of "About" info.
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The primary feature associated with the (also referred to as the Facebook Locked Profile Picture Viewer) is its ability to display a full-size version of a locked profile picture . Key Feature: Locked Profile Picture Unlocking Facebook does not track who views your profile,