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A Facebook popper is someone who logs on fast, checks who's online, and if none of their friends are worth talking to, they log off so quick it looks like they got hit by a lightning bolt.
I logged on, saw my ex was online, and popped offline faster than a chicken loses its head.
He saw 5 of his friends online and popped off like he was running from the cops.
She checked her feed, saw no cool posts, and logged off like she was getting a root canal.