If you want to save society, the mental health of our children, and preserve a sane and functional democracy, etc, etc. Stop working for Facebook. Quit working for that leadership. Let their talent erode and their technical debt lead to atrophy. Don't expend your finite life living and slaving for this empire of evil. The next best step is to pledge to not hire ex-Facebookers.
Please stop assuming everyone shares your values and beliefs. Personally, I think that while there is some mismanagement at Facebook (that can be fixed) most of the issues brought up can probably be expected from anyone in this problem space at this scale. Facebook has allowed me to discover a lot of opportunities and connect with some long lost friends, so I would say the cost is worth it.
This value that they are providing should not necessitate the wholesale pillaging of user data. My data is worth way more to me than a simple weblog service. These thieves are trading trinkets for land and the natives just don't realize how valuable their land actually is. (hint - it is worth way more than FB charges their advertisers)