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It's pretty taboo to drop out of university in the US as well. The article also relies the false causality link between dropping out of university and being successful.

University incubators typically focus on research spin-offs (both in the US and the UK) - while US universities in general are better at this than UK universities, it doesn't really have any relevance to Facebook style companies.

There does seem to be a higher amount of risk-aversion though.