Just a year ago I'd have thought it'd obviously land him in hot water, and probably get him impeached in short order if he refused to divest.
I no longer think that. Even massive, wholly overt corruption is apparently fine now. Along with a bunch of other stuff. There are no rules now as long as you can get elected, you're useful to one party or the other, and that party retains enough seats to block impeachment.
Berlusconi is precisely the kind of person who's in power now, and it's taking months of slow, grinding work to maybe, maybe catch him on something bad enough he can't ignore it, while he's plainly profiting from the office and hasn't attempted to avoid actual conflicts of interest, let alone the appearance of them, and that's not even the thing we're trying to throw him out over.
At the highest levels of American power, you can now openly be as corrupt as Berlusconi and... no one cares enough to do anything about it.
So yes, Zuck totally can. Which makes the prospect of his presidency all the more worrisome.