Yeah; it sounds like that is maybe the case. Reminds me of the concern around a "dark start" if the power grid goes down where you can't bring up certain power plants because they need power to start.
I'm guessing Facebook upgraded everything to the highest level tech and inadvertently got thrown back into the stone age.
There was a great talk on this on the 32C3; unfortunately only in German: https://media.ccc.de/v/32c3-7323-wie_man_einen_blackout_veru...