That is what I suspect but still.. Respect in the eye of peers is a human need. If I met a developper and learned he works for FB, it would be visible on my face that I feel somewhat put-off.
'Peer' is very flexible. This could be a comparison to people the same age in other careers.
Also, keep in mind that Facebook engineers are constantly surrounded by other Facebook engineers so their SE peers probably do approve. They collectively don't think Facebook is a problem so they implicitly approve of each other.
