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You post a comment on someone's status, then instantly realize it's the worst thing you've ever written, so you delete it, but the notification still says you commented, and now everyone is mad and confused about what you meant.
You comment 'This is the worst post ever' and then delete it. Now everyone is wondering if you're trying to be funny or just being a pain in the ass.
You write 'I love this post' and then delete it because you realize you're being fake and everyone knows it.
You type 'This is amazing' and then delete it because you’re too lazy to actually say something cool.