Just kidding, he was pretty terrible. But then you remember his company is worth about 50 billion dollars and he probably couldn't care less that acting isn't his strong point.
Jesse, Andy Samberg, and the Facebook founder all met on stage for a Zuckerberg vs. Zuckerberg vs. Zuckerberg throwdown. Check out how Jesse and Mark handled the confrontation, and then get on Facebook and poke someone. Because after all, Mark invented poking, and damnit, you should honor that!