Asher Moses - reporting for The Sydney Morning Herald - pulls together a swag of Australians who've flown the coop for the United States. Nick Crocker, one of the smartest tech kids I know, kills it (as usual):
But largely it comes down the markets. The US market is 10x bigger, with a greater hunger for new, better technology. There's successive generations of tech entrepreneurs in Silicon Valley dating back to the '50s with Shockley Semiconductor Laboratory and Fairchild Semiconductor. Each new success spawns new success. We've seen it from Paypal. We're seeing it from Facebook.
At the end of the day it's all about scale, be it machines, or people. Think about it: would Facebook have ever grown to the monster its become if it was coded by an Australian geek studying at UNSW? Facebook propagated via the universities. There's around 40 in Australia. There's over 4,000 in the United States.