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This just gets funnier the more we learn. Apparently the length of the outage was in part due to the engineers being locked out of their own server rooms.
Facebook slowly comes back to life, with some glitches • The Register...Facebook’s seemingly accidental and sudden withdrawal of BGP routes to its own DNS servers, causing look-ups for Facebook domain names, such as facebook.com and instagram.com, to fail when those servers vanished from the internet.
This not only brought down Facebook's empire of apps but also apparently even caused door keycards to stop working on Facebook's campus.