"Blah happened at Facebook and it is potentially a company ending event."
This causes me to almost immediately discredit them, as while serious, this is no where near a company ending event for an organization that is headquartered in the US.
Equifax lost the personal data of all Americans and is doing fine.
Facebook might get fined a metric ton of money, people in some portions of the world might leave it, but the company will be just fine. You see, there is no where else for those people to go. Presumably they're on Facebook for some reason so they would want to find an alternative and there isn't an alternative that is as easy to use that their friends and family will migrate to.
Like many other compromises, this one will be forgotten. There is no wordlist that will come out of it, no public artifact that will exist. People have already forgotten about Adobe, LinkedIn is fading, and this one will eventually join their ranks.