I don't know Zuckerberg or anyone that has close contact with him at Facebook. He's strikes me as the kind of person who is obviously smart, but doesn't realize

I don't know Zuckerberg or anyone that has close contact with him at Facebook. He's strikes me as the kind of person who is obviously smart, but doesn't realize how smart he is because he's always been surrounded by smart people. A cocksure attitude can be a weakness unless you're trying to lead and reassure people that everything is under control.