"For privacy reasons, this app only lists users who have interacted with your profile at least once during your friendship (e.g. by writing on your wall, or liking something). Real stalkers (the creepy kind) are protected by Facebook Privacy, and will never be revealed, by this or any other app."
seems kinda not true, because the people who might check your profile daily and stuff, but never interact with you on your wall, don't show up. it only shows the people who have interacted with you at least once.