Facebook has finally given a reason for the six-hour outage Monday

Facebook was down for six hours on Monday | Illustration by Alex Castro / The Verge

Facebook said in a blog post Monday night that the six-hour outage that took it offline along with Instagram, Messenger, Whatsapp, and OculusVR was the result of a configuration change to its routers — not of a hack or attempt to get at user data. The explanation doesn’t give much in the way of detail, but it seems like Facebook’s machines weren’t able to talk to one another — Facebook says that “this disruption to network traffic had a cascading effect on the way our data centers communicate, bringing our services to a halt.”

CEO Mark Zuckerberg posted an apology Monday evening, saying the platforms were coming back online. “Sorry for the disruption today — I know how much you rely on our services to stay connected with the people you…

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