Google.
1. Facebook's motto is "move fast and break things". I would prefer if it was "move fast because you have the systems in place to prevent broken things from reaching production".
2. Facebook's new HQ is going to be a single room.
A single. Room.
This is a company run by people who apparently didn't read Peopleware ... if they've even heard of it.
Basically, it's a personality thing. I am mortified by screwing up. That's not a perfect character for business success, I realise. Foolish optimism is the oil of capitalism.
But it's who I am. I suspect I would be deeply uncomfortable with Facebook's culture.