What happened before they whiffed on earnings doesn't matter, new information came out and the market ran away from Facebook like it was contagious. 32,725,304

What happened before they whiffed on earnings doesn't matter, new information came out and the market ran away from Facebook like it was contagious. 32,725,304 FB shares have traded after the bell, that is a "real market". The 10-day average daily volume is ~17.5m so this is hugely significant.