During host Jesse Eisenberg's monologue on tonight's Saturday Night Live, the Social Network star was surprised on stage by Andy Samberg-as-Mark Zuckerberg. But that wasn't all—shortly thereafter, the *real* Mark Zuckerberg showed up... and it was incredibly awkward!

Rumor has it Mark Zuckerberg might make a cameo on this week's SNL hosted by Social Network star Jesse Eisenberg. Here's an idea for a sketch: Mark Zuckerberg develops a highly-inaccurate social network based on Jesse Eisenberg's college years.

Pop star Katy Perry swung through Facebook's headquarters for a visit. What did she do there? Pose with employees, eat at the cafeteria, and not much else as far as we can tell. But it looked fun for the employees!

The Social Network depicts Facebook CEO Mark Zuckerberg as an antihero who ends up chastened, awkward and lonely. But now that the movie has gleaned $200 million and four Golden Globes, its makers are proclaiming Zuckerberg a valorous rock star.

[Facebook CEO Mark Zuckerberg hanging out with his friends, Harlem Globetrotters Curly Neal and Hot Shot Branch. Later, with the assistance of Scooby Doo and the gang, Zuck and the Globetrotters solved the mystery of the haunted amusement park. via]

After we published photos of his old house—and he gave Oprah a tour—Facebook CEO Mark Zuckerberg moved out, relocating to a new security camera-studded home a few blocks away. Now his neighbors are gossiping—and they've sent us pictures.

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It started with Pajama Jeans, the eye-searing fashion hybrid that's taken over our TVs. Now comes Jumpin' Jammer'z. Yes, they're footie pajamas for adults. Listen up, people: It's time to put down the sleepwear and start wearing real clothes again.

Time was, Weekly World News reported on UFO sightings and all manner of human-animal hybrids. But the new supermarket tabloid hotness is a fake rumor about Facebook. Did you know Facebook is shutting down on March 15th?

On Monday, news broke that Goldman Sachs had invested $500 million into Facebook, valuing Mark Zuckerberg's social network at $50 billion. Tonight, Jon Stewart laid bare the real—and hypocritical—reason for the investment: an avoidance of government-regulated transparency. Uh-oh.

Goldman Sachs and Russian investment firm Digital Sky Technologies have invested $500 million into Facebook in a deal that values the social network at $50 billion—more than eBay, Yahoo! and Time Warner. What's cool now, Justin Timberlake?

Fresh off his tour of mainland China, Facebook CEO Mark Zuckerberg celebrated the New Year in Taiwan. Above, Zuckerberg and his girlfriend stroll through Taipei's famous Snake Alley market on Thursday. He even stopped for a picture with a fan.

Technology seemed especially relevant in 2010, what with The Social Network's blockbuster receipts and mass mania for Apple's iPad and iPhone 4. The newfound attention helped turned some techies into genuine stars — while lending others real worldwide infamy.

A while back, we paid a paparazzo to tail Facebook founder Mark Zuckerberg. But during his high-profile trip to China this week, Chinese fans are doing the stalking for free. Here's a gallery of their Zuckerberg-in-China snapshots.

Now that Facebook CEO Mark Zuckerberg has overthrown the internet and been named Time's "Person of the Year" is there anything left for him to do? Yes: Conquer China, beginning with this weekend's visit to Beijing.

Today we wrote very serious things about Time magazine's boy genius Mark Zuckerberg and the barely literate FDNY entrance exam, and how did you respond? The only way you lovable perverts know how: with half-naked guy pictures.

Facebook's CEO had a huge year, what with the Hollywood blockbuster about him and the explosive growth of his social network. Now, as if to confirm the culture's Facebook obsession, Time has named Mark Zuckerberg "Person of the Year."

The Winklevoss twins are at it again! Tyler and Cameron, the crew-rowing siblings who walked away with a $65 million settlement after suing Mark Zuckerberg, have filed another suit against the Facebook founder, saying they didn't get enough last time.

Tonight, 60 Minutes aired its Mark Zuckerberg profile. Also featured: the Winklevii, aka twins Cameron and Tyler Winklevoss, who sued Zuckerberg for "stealing" their idea. And once again, Zuckerberg came out on top with a smart, sassy dis. Watch inside.