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

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.

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