I agree. It's not just software either. Their work on OpenCompute, which opensources datacenter designs and server designs, has also done really impressive work. Their interest in Occulus shows their appreciation of advances in IO hardware.
Facebook is where these techs go to die. Facebook has a lot of interest in these projects, and a lot of cool, smart, motivated people working there. But they have no cohesion, no direction, and no way to build on top of one another - Everyone at Facebook is constantly re-inventing the wheel.
