Actually my experience growing up in NYC (and this may be an outlier, but I see it elsewhere) is that immigrants are more likely to be entrepreneurial because traditional employment is off limits due to language, cultural, and educational barriers–and sometimes outright discrimination. That's why there are New York archetypes of Korean green grocers, Chinese dry cleaners, Greek diner owners, etc (albeit these are rapidly shifting). The large number of Jewish-owned businesses in NY speaks to the historical discrimination against Jews (and not just some stereotypical belief about business acumen). Not exactly social networking and cloud computing, but entrepreneurship nonetheless.