I deeply disagree with this on a level that will be difficult to capture in an Internet comment, but I will try:
What you're describing is the advancement of technology, which has occurred at the institutions that have accumulated the most power. Yes, Facebook, Google and others have hired some of the most talented people in the country, and these people have continued to produce useful technology while ensconced at these companies. Previously the same people could be found at AT&T, Xerox PARC, various DARPA-connected institutions, etc.
All you're describing is the shift in the center of power. In the 50s and 60s it was the government. During the 70s, as power began to shift more and more away from government towards private capital, we saw more and more technologists moving into the employ of monopolists.
It is a mistake to confuse this transfer of power, and the corresponding ability to purchase talent, with the output of that pool of smart people. Moreover in Silicon Valley these people are deeply connected to a much broader community of intellectuals (e.g. through HN) - I'd argue that this culture, of which many members currently sojourn in the arms of large corporations like Facebook, is the real productive unit.
Facebook found a money faucet and connected these people to it; but this money faucet could have been anything. It could have been something of real social value, except we have largely destroyed the mechanisms that direct productivity on the basis of social values and now direct it purely based on the interests of private capital, which is currently enamored with data accumulation and targeted advertising.
I'll end here, but I'd also like to point out that a lot of the stuff you've listed here existed long before Facebook and Google were a twinkle in anyone's eye. You're taking things that were literally developed in the 60s and giving credit to them for the private concentrations of power that were built on top of that work.