The act of posting status updates in an angry state of mind. Normally about how other people "annoy" or "piss me off" and is generally bothersome to other people who may read, though other people may just jump in behind them.
Person A: ARGHGGH person C makes me SSOOOOOOO ANGREHHH! blargh!!!!11!!one!!!!!1!eleven!!!
Person B: OMG I AGREEEEEEEEEEEE
Person D: Enough of the angry facebooking...