Zuckerberg leaving his Palo Alto house. Despite his wealth—his shares in Facebook are worth an estimated $4 billion—he lives a very low key lifestyle.

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The Facebook CEO lives in a rental in the College Terrace neighborhood, next door to YouTube founder Jawed Karim and surrounded by locals upset at the influx of cars to Facebook's new, nearby headquarters.

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Zuckerberg in his driveway. Behind him is his Acura TSX, which is a couple years old and worth about $20,000. "It's an entry-level luxury vehicle," says Jalopnik editor Ray Wert. "It's the sort of car you might see a first-year lawyer driving."

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With girlfriend Priscilla Chan, a fellow Facebook employee. Zuckerberg offered her a job during a visit to Harvard in 2005, at which point he'd already been away from school for a year. She said "sure" and offered him a Twizzler.

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After graduating in spring 2007, Chan finally took the Facebook job and moved to California. Not that she was an easy hire: Zuckerberg's long-distance sweetheart demanded a contract specifying one date per week and 100 minutes of alone time, minimum, before agreeing to move out West, according to tech writer Sarah Lacy.

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At a Stanford University graduation ceremony.

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Zuckerberg is clearly addicted to his iPhone 3GS—he was seen talking or tapping constantly. But he has issues with the phone as well. Days after getting the device, he began complaining on Facebook about AT&T's cellular coverage. He's since upgraded to an Android phone.

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Sister Randi, right, is a Facebook marketer and, apparently, fellow iPhone addict.

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According to her Facebook profile, Randi Zuckerberg handles "strategic partnerships related to media," including roping stars like Ricky Gervais into discussing the social network. She's also something of a fameball.

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The Zuckerberg social circle, including possibly director of engineering Aditya Agarwal, left.

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Hitting Antonio's Nut House, a bar, with friends.

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Antonio's is a well-known dive; the Yelp reviews talk about the "sticky tables and chairs," "clientele who look suspiciously like they may be using a fake ID," and the "hard ass bartenders."

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More hanging out at the Nut House with friends. We've seen Alpha Epsilon Pi alum Zuckerberg party, thanks to his Facebook profile.

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When Zuckerberg isn't partying with friends or hanging out with Chan, he's learning Mandarin. Here's his tutor, Xiaoqiu Xu, a PhD candidate at Stanford's School of Education and a former lecturer at Nanjing University in China.

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Tutor Xu again. We have no idea why Zuckerberg is learning to speak Mandarin, but will note that the language might be useful to someone planning to ask his Chinese girlfriend's parents for her hand in marriage. Just saying.

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On his way to a party with Priscilla. She's holding the whipped cream, as you can see.

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Mark's a multi-tasker: He can show affection and talk on the phone at the same time.

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Mark's got the cake.

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The party's over, but somehow the Smirnoff Ice is unfinished, along with a couple of cakes. Actually, scratch that, maybe the party's just getting started.

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