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A Facebook dupe is someone who gets roasted every time they post something dumb and ends up with more comments than likes because their brain is made of garbage.
'I ate 10 burgers today. I'm a legend.' 1 like. 10 comments: 'You died.'
'I passed my math test!' 2 likes. 5 comments: 'You failed last week.'
'I'm rich now!' 0 likes. 3 comments: 'You’re broke.'