Facebook must be going out of the way to reject Americans, and insist on hiring H1Bs for their openings. They probably pay low wages and the people who can get past their interviews must be thanking their gods they got out of shitty life back home and happily work as indentured servants at low pay.

Edit: About the big corporate job part, sorry about that. If you're looking, I'm happy to put you in touch with engineers at Fb (and a couple of other companies).