Mark Zuckerberg hired the wrong celebrity to open for him before his presentation of the new Facebook Timeline. Instead of Andy Samberg, he needed Jon Hamm. After the comedian did his impersonation of the social network founder, the 27-year-old billionaire did the actual honors himself, tenderly scrolling through his own digital scrapbook and pointing out some personal details of his own life: his dog Beast, his love of bison burgers, his awkward childhood. "It's the heart of your Facebook experience," said Zuckerberg. "Completely re-thought from the ground up." It was one of Zuckerberg's best public appearances--if not the best. Still, Zuck's got nothing on Don Draper.