Facebook employees and an internal memo say that, several hours into the incident, Facebook's security experts were still trying to identify the root issue (New York Times)

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New York Times:
Facebook employees and an internal memo say that, several hours into the incident, Facebook's security experts were still trying to identify the root issue  —  SAN FRANCISCO — Facebook and its family of apps, including Instagram and WhatsApp, went down at the same time on Monday …

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