We know what Facebook cofounders Mark Zuckerberg, Dustin Moskovitz and Chris Hughes are up to. Zuck lets COO Sheryl Sandberg run most of the company now while he plays industry visionary; Moskovitz is hiding from Valleywag's fearsome scrutiny; and Hughes is busy spamming your inbox with updates from Obama campaign director David Plouffe — sorry, revolutionizing politics on the Web. But where have unacknowledged cofounders Andrew McCollum and Eduardo Saverin gone? Their Facebook profiles aren't open to the public, but rival social network LinkedIn isn't nearly so skittish. Here are their profiles, with our notes:

As Facebook's theoretical value soars, the interest of its hangers-ons grows practical indeed. I think that's why Cameron Winklevoss, Tyler Winklevoss, and Divya Narendra are pursuing their lawsuit against sandal-sporting Facebook CEO Mark Zuckerberg with such tireless vigor. But the three Harvard school chums, who say they hired Zuckerberg to work on their competing ConnectU site before he launched what became Facebook, are far from the only ones pressing a claim to have been present at Facebook's creation. (For the record, long-suffering Facebook PR chief Brandee Barker says the company's official cofounders are Zuckerberg, Chris Hughes, and Dustin Moskowitz.) After the jump, a gallery of everyone who's not an official founder — but who'd like to be.