i try to be respectful but this is some bs virtue signaling devoid of any nuance and steeped in economic privilege that you were likely fortunate enough to grow up with. you have no right to look down on people working a job you perceive as morally dubious for money. and you seem to think that every job at fb is about glueing eyes to ads. what about people who work on cybersecurity, or counterterrorism, or combating child exploitation? there are thousands of positions where you make measurably good impact on the world.
EDIT: you certainly can look down on people for whatever, i just don't think it's justified in this case.