There are many fallacies with the argument that the greatest minds are at the googleplex. Google does hire some smart people and probably engineer for engineer, they probably stack up better than the averages across the US.
But, great people do great things. They don't necessarily work at google. And they don't necessarily advertise.
Who are the people that wrote the software that put the Mars Rover on Mars? What about the people that work on reddit? I am using Ubuntu12. What about the work that went into that?