Yes, I assume that European are as smart an entrepreneurial as Americans, therefore the kinds of companies they build are likely a result of the regulatory environment.
There aren't big European social networks, but that might be caused by the fact that Europe is linguistically and culturally very fragmented. Which does not matter as much if your product is an antivirus, but it does matter when you build a product whose value is in the sheer mass of mutually communicating users. The Anglosphere is HUGE.