Facebook's data center costs are now $50M/yr to lease almost 60,000 servers (allfacebook.com)

That is not bad at all. Including support, our data center costs are ~2mil a year for 60 LPARs spread across 2-3 frames.

They spend more than that on humans. From the ones I know, they seem to be quite smart and good at getting computers to do the computing work while the humans can think of better stuff for the computers to do.