Facebook is a Web 2.0 service, as in members/users submitting all the material, so what will all those people do?
Facebook Plans for 9,400 Workers at Headquarters – Sourcing – ITBusinessEdge.com
Sell ad space? That’s also handled Web 2.0 style and going through Microsoft’s ad network.
Lawyers? Hopefully not that many.
Developers? No way that many are needed.
Because they can?
And so on and so forth.