> but I know several who are staying because they feel that their position is where they can produce the most good for the world

Do you think Facebook is a net positive for the world? Borderline, or overwhelmingly?

To be clear, I'm not asking whether some people get net benefit out of it, I'm talking about the net overall effect on society and the individuals within it.

Personally, I believe it is causing tremendous psychological damage, and that anyone that works there is a contributor to that end.