I think they're very different messages. Sean Parker's message comes off as more self-serving - saying don't start a company because it's not as good for the world as joining one that can effect change to a greater degree. Zuckerberg's comment was about not starting a company for the sake of it, the same message PG had and a very good one. Start a company because they're the most efficient vehicle to solve a problem you care about. Don't fabricate some problem that doesn't exist because you want to start a company.