Why do people act like they know everything about you and your life just because they’ve seen you post on social media?

Why do people act like they know everything about you and your life just because they’ve seen you post on social media? That’s such a stupid thing! Like you don’t know me. Just because you’ve seen me post online doesn’t automatically mean you know everything about my life! You know nothing!
Why do people act like they know everything about you and your life just because they’ve seen you post on social media?
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