with 93 billion dollars, one can, say, invest in all reasonably promising startups in the world continuously for, say 10 years, perhaps? And a couple of them will turn out to be Facebook/Google. (I have no data at hand to back that up, but 10 billion a year sounds more than enough? there are about 20 top VC firms in the Valley, and few of them has funds bigger than a billion dollars, and they typically invest over 5-7 year periods).