Working for Facebook is a morally bankrupt position. If you are an engineer you have plenty of job opportunities available to you and there is no excuse for you to continue contributing your labor and time to a wholly malignant organization. At a certain point one has to ask how we as an industry will start dealing with those who continue to take a paycheck from Facebook even in the face of constant and horrific evidence of wholesale ethical violations and negligence.
Being human is a morally brankrupt position. Accumulating wealth is a morally brankrupt pastime.
If you want to be a morally pure human, starve yourself -- that's the only way.