"The U.S. has the world’s most sophisticated system of financing radical ideas, and the results have been impressive, from Google to Facebook to Twitter."
Not one of these began as a "radical" idea. I have a ton of respect for Google, as it certainly does some radical things today, but it started out as just a better search engine. And Facebook is hardly even an idea. Don't even get me started on Twitter. They certainly provide lots of value, but the initial concepts are not radical whatsoever.
Concepts/companies like solar roadways, Tesla, and SpaceX blow Facebook, Twitter, and even Google out of the water in terms of radicalness.