Paul Graham claimed in 2004 that the winning candidate each presidential election is actually the candidate with the charisma.

http://www.paulgraham.com/charisma.html

Since then, Obama beat McCain and Romney and Trump beat Clinton.

While it's hard on the ears to hear that Trump is charismatic, the reality is that his social intelligence is off the charts. That's why Scott Adams predicted early that he would win (as did I and I won some money betting on it even while I voted against him).

I don't see president-level charisma in Zuckerberg, although I'm not sure because i haven't watched him that much. I know at least one person who is really fascinated by him so maybe it's worth a second look.