How did they get their hands on an 0day? Probably found it. It isn't like you have to buy plutonium from some Libyan nationalists -- Facebook has plenty of sm

How did they get their hands on an 0day? Probably found it. It isn't like you have to buy plutonium from some Libyan nationalists -- Facebook has plenty of smart engineers who can audit the software they use. I've seen 0days found by engineers at other tech companies, so I find it likely that somebody at Facebook could run across one if they tried.