still, when something goes wrong, it goes very wrong. we want to make clear at this time we believe the root cause of this outage was a faulty configuration change. we also have no evidence that user data was compromised as a result of this downtime. the outage was said to have caused mayhem in facebook�*s headquarters here in silicon valley, as technicians scrambled to work out what was going on. facebook was losing over £100,000 a minute and its share price fell. mark zuckerberg personally lost around £4 billion. most of these kinds of outages last for around an hour. what made this so unusual was how long it took to fix. and the scale of it, too — the outage wasn't localised, it was global, affecting users across the world. you might see... this couldn't have happened