From a purely technical standpoint, there is no such thing as a "backdoor" or secret exploit that allows a third-party website to bypass Facebook’s privacy settings.
Go to Settings & Privacy > Settings > Profile Locking . This restricts non-friends to seeing only a small thumbnail of your profile picture and no posts.
If you legitimately need to see someone's private Facebook updates, you should rely on transparent, ethical communication rather than shady software hacks.
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If a loophole or glitch ever allowed outsiders to view private profiles, Facebook’s security team would patch it within hours.
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