What it means is that this person had either deleted their account, has blocked you :( i hate it when it happens to me it could mean that you have not signed in to it and your a guest and not a member
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When a person's name on Facebook is displayed as "Facebook User," it typically means that the user has deactivated their account or changed their privacy settings to limit who can see their profile information. It could also indicate that the profile is not fully set up or verified by Facebook.