Does Zuckerberg fly in a private jet frequently or at all?
Yes he does, there are tonnes of articles about the CO2 emissions, at the end of the day the only reason this is interesting is because Musk was so thin skinned (and hypocritical) about the whole situation that this became news. It's probably one of the best examples of Musk creating a problem out of nothing. No one cares about Zuck's private jet, because at the end of the day he's done a fantastic job of being extremely boring.