Elon Musk has been an technological innovator and game changer in software, in space flight, in energy, in automobiles while pursuing ideas like the hyper loop and Mars colonization. He seems genuinely concerned about the planet and the fate of humanity as a species. Mark Zuckerburg invented the largest advertising platform in the history of the world and seems more concerned with expanding Facebook as a personal profit center than with the internet as a global resource for information and communication