Facebook guerilla
A Facebook buddy who hides your posts until you say something dumb, then they jump in and cuss you out like you hit them with a bat.
You post, 'I just won the lottery.' They say, 'You’re lying, you fat liar.'
You say, 'I’m going to be a billionaire.' They reply, 'You’re a fool.'
You post a selfie. They comment, 'You look like a raccoon.'