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When people comment the same stupid thing on a Facebook post because they're too lazy to scroll down and see what's already been said. They're like, 'I didn't know that was already here!'
'This is the best post ever!', said by 12 different people who didn't even look at the comments.
'I love this!', said by a guy who just saw the first comment and thought it was a secret.
'This is amazing!', said by someone who didn't know that 8 other people said the same thing.