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:

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