I don't despise Mark Zuckerberg like many do, but I hardly think he qualifies as a tech leader. Facebook succeeded through luck, timing, hard work and good engineering. That's all laudable, but there wasn't much leadership or vision involved. Bezos' initial idea, an online bookstore, was hardly visionary or leading but subsequent decisions, especially the decision to standardize internal system interfaces that led to the idea, and ability, to create AWS absolutely was visionary. Google should have done that, but didn't have the vision. There's no debating the vision of Elon "Mars or bust in my solar-powered electric car" Musk. Musk has so much vision we'd call him a crackpot, except that he has a tendency to succeed. Steve Jobs was clearly a leader and a visionary with a focus on making technology simple and beautiful.
And there are other leaders around who I'd say are much worthier than Zuckerberg. Larry Page, for example, whose goal for his new startup was to "Organize the world's information and make it universally accessible and useful", an insanely ambitious mission which arguably is no longer ambitious enough to describe what Alphabet/Google is doing. Mark Shuttleworth, not so much for Thawte as for Canonical, where his vision hasn't really succeeded in displacing Windows but has gone much further than most of us considered possible. Though a bunch of CEOs probably wouldn't pick him, I'd put Richard Stallman high on the list, too. His vision of the importance of software freedom has been incredibly influential.
I could go on, but the point is... Zuckerberg? Really? For what? I suppose it was visionary to believe that you could build a billion-user interactive system with PHP.