Maybe the ZuckerKid doesn’t want people to make fun of his wall building.
Zuckerberg family sponsored Russian Jews families to migrate and settle in USA. One family is my friend.
I think he is hedging his bets. He wouldn't like to be on Trump's wrong side when he wins. He may even know something we don't about the election and as a farsighted CEO of a huge company, he is adjusting his course ahead of the upcoming events.