Most Facebook Inc (NASDAQ:FB) users think that when they set their friends list privacy to “Only Me,” it means that they are the only ones who can see it. However, anyone can take advantage of a loophole in the privacy. As Mashable reports, that loophole is the social network’s mutual friends feature.

All users can see mutual friends between any other two users if one of them has made their friends list publicly available. So, for example, if one user keeps her friends list private but her closest friend does not, then a third party could compare the two users’ lists to see all the friends they have in common.

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