At this point, I think it is unproductive to comment on Zuckerberg as an individual (ad-hominem attacks?) because this leads to assuming that any alternative CEO would be better. I don't think we've had any solid evidence so far that he's naïve or a "sleazebag". However, what might be more frightening is the fact that he appears to be very normal and that many of us might share more traits with him than we'd be comfortable with admitting. Or perhaps that isn't frightening for many, and he is who some still aspire to (just like how many admire the management style of Torvalds or Jobs).
Facebook's business model doesn't depend on Mark Zuckerberg's "magic". It will continue to grow or break regardless of whether he's at the helm or not. Users, advertisers, competitors and governments will have to be the ones to decide.
I remember being 20 years old and no, I haven't been calling people "dumb fucks" in private conversations; to the contrary, I ran a small website on geocites in 1995 (if you don't know them, google it) and was super-happy when I had people commenting on it. Last thing my 20-year old would call them was "dumb fucks" for merely entertaining with my site.
Hmm typically when someone says that people are "dumb fucks" it usually means they are simply incredibly naive /s