(Also, please don't work for Facebook. You have talents that can be applied at a more ethical company.)
Just saying "Please don't work for Facebook" is just so tone-deaf. Maybe YOU can work for a more ethical company, doesn't mean OP can.
I don't know if it applies for majority of people but in my social circle we treat palantir with stigma and actively tell people not to work for them. So, is it really mean to tell that? What can normal people do ? Telling people not work will help society in long run and also signals advertisers, consumers not to use their product:) It is similar to why USA has banned companies to not use any kind of cotton produced from xiangxinag although they might not personally know if that company is in mortgage and can afford to survive if they don't use cotton from china?
If you work for Facebook then you have in-demand skills that will command a high salary elsewhere. Facebook is a highly unethical company and people should avoid working for them, your imaginative story notwithstanding.
There are plenty of people at FB that work in privacy and integrity. If all of the ethical people left only the unethical would be left.