Mark Zuckerberg is Socially Awkward
Mark Zuckerberg at the 2011 G8 summit

Zuckerberg has been known to wear a tie from time to time, like when he met with world leaders and businesspeople at the 2011 G8 summit in Paris.

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Mark Zuckerberg is a nerdy geek, and we all know it. If you saw "The Social Network," you know he spent his college years skulking around campus in rumpled clothes, couldn't get into a prestigious social club and his few friends consisted of fellow geeks and loser types.

So not true, cry those who know him well. Harvard roommate Joe Green calls him über-confidant. Author David Kirkpatrick, who had access to Zuckerberg and the entire company while he researched his book "The Facebook Effect," says Zuckerberg is funny and not just social, but "extremely" social [source: Miller].

Another author, Karel Baloun, worked at Facebook for a year, then wrote a book about his experience. Baloun says Zuckerberg actually was rather socially awkward in the not-too-distant past, but he's been working hard at improving this part of his personality, and today's he's a pretty socially unawkward dude [source: Rohrer].