Media announces hackers have 1.5B FB username/password combos and other user details up for sale today. FB kills DNS access to allow for password resets. There's your explanation.
https://www.msn.com/en-us/news/technology/15-billion-facebook-users-personal-information-posted-for-sale-after-hack/ar-AAP8eUl
And allow hackers to login, perhaps to admin accounts, in the meantime?
I doubt that you are an idiot. One might wonder if they ran a force logout/password change reauthentication script on the backend during the outage. One also might wonder if someone managed to buy the right access credentials to gain ownership of the servers. One might wonder if Zuckerborg or anyone else in Menlo Park even controls FB anymore. One might wonder if Vlad made good on his threats and now the Russians control the algorithms.