Yes, democracy is the worst form of governance except for all of the other ones. I trust more in our government than I do in zuckerberg. Letting him continue the path that he and only he decides does not seem like a good idea.
I find it odd that you exalt democracy and the idea of limiting individual freedom in the same paragraph. Zuckerberg isn't a government unto himself and answers to shareholders and board members; one of which served as Chief of staff for the National Economic Council in the Obama administration. You seem to think that our government and large corporations are separate and isolated organizations, but the people that work within them often slip between the two. Taking Zuckerberg out of the equation will certainly not change the game.
So then what is your solution to this?
due to Facebook's corporate structure, I don't think Zuckerberg actually answers to the shareholders and board members.