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Facebook introduced the feature primarily for users in countries with high concerns about online privacy, harassment, and identity theft. It is a one-click privacy fortress.
This is a legitimate privacy feature, not a bug or loophole to be exploited.
Here is the truth about online Facebook profile viewers, why they don't work, and what you can actually do instead.
If you and the person are in the same Facebook Group (like a community group or an alumni page), you might be able to see their posts inside that group, even if their main profile is locked.