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Spying on a friend's latest updates to find out what's going on in their life, then using that info to torment them like a sadistic troll.
Your friend posted a photo of them at a party with a stranger. You message them: 'You were cheating on your girlfriend? I saw it.'
Your friend's status says they're 'working late again.' You reply: 'You're hiding from your boss, aren't you? I know your secret.'
Your friend posted a picture of them eating a giant burger. You tag them in a post: 'You’re a slob. I know you're ashamed.'