For the users, Facebook is just a means of communication, among many others. If it disappeared tomorrow 10 different platforms would replace it and the level of goodness in the world might even increase.
Doing good is probably the lamest, least truthful excuse for working at Facebook, goes to show how self-deluded people can be.
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.
Sticking to the "net positive / net negative" terms, imagine Facebook contributes a number of positive / negative points to the world. Now the sum can be a net negative, but that doesn't mean some line items aren't positives.
Where do you work? Is your company flawless? Are you a contributor to every single one of its misdeeds merely because you work there? This isn't an easy thing to answer for everyone. I think it's certainly a question more Facebook employees should ask themselves though.
There's a lot of FB employees on HN and I wager a lot of them know how scummy their employer is. Yes, many are staying for the paycheck (and because leaving a job isn't an easy thing for everyone), but I know several who are staying because they feel that their position is where they can produce the most good for the world.
Similarly, I know many people in politics who despise who/what they work for, but keep at it because that is where they can make a difference.
It doesn't always work. But it also doesn't make me think less of them. At least of the ones who aren't staying because of the $.