Facebook doesn't build their own servers. They outsource to Quanta and Sanmina. Quanta is the hardware OEM and Sanmina handles the racking, configuration and testing. Facebook provides rack specs and the Linux image. Facebook tried to design their own servers via the Open Compute Project but they ran into heat dissipation problems. Sanmina's Newisys division (which makes dense storage arrays using by places like Amazon & Shutterfly) helped solve their problems.
The point is that, while Facebook may be able to do hardware, servers is not a good example.
Disclosure: my team at Sanmina has been responsible for delivering the test automation & integration software for the rack assembly & test operation for Facebook.
For that matter, Google itself doesn't build anything at scale, either. Why would they? They outsource all their high-vol manufacturing to the same EMS companies everyone else uses (Quanta, Compal, Foxconn, Flextronics, Sanmina, Celestica, Jabil, Pegatron, Benchmark, Plexus and a handful of others).
The point is that, while Facebook may be able to do hardware, servers is not a good example.
Disclosure: my team at Sanmina has been responsible for delivering the test automation & integration software for the rack assembly & test operation for Facebook.
For that matter, Google itself doesn't build anything at scale, either. Why would they? They outsource all their high-vol manufacturing to the same EMS companies everyone else uses (Quanta, Compal, Foxconn, Flextronics, Sanmina, Celestica, Jabil, Pegatron, Benchmark, Plexus and a handful of others).