As far as I can tell almost his entire adult life has been spent making money off of people either by indirect victimization or through selling their personal data. That doesn't strike me as someone who is interested in political service for reasons I'd consider appropriate.
That's just the Facebook risk. There's also the problems that can come from his actions as President in general. ;)
He is a company man. Wouldn't be the first company man to become president. Although afaik he would be the first jooish president.
If I had to vote for a businessman, I would rather vote for the one who actually made something innovative. And Zuckerberg speaks Chinese, and even if he isn't fluent and would probably never be allowed to speak with Chinese officials without a translator for protocol's sake, having a bilingual President would be a breath of fresh air compared to one who barely speaks English.
Although this may just be a case of me preferring a competent evil to an incompetent one.
They're both fucking ridiculous concepts as the leader of a country. That you've got one of them now should be eye opening enough that this doesn't happen again for a fucking long time.
Putin would be better. Kim Jong Il might be better.
I'm not joking. ;(