For a hot, pre-IPO startup I'm surprised that Facebook seems to be going through an exodus of co-founders (how many do they have?) and well-respected key employees. Just this year alone we've seen the following exits

• Adam D'Angelo (former CTO and co-founder)
• Matt Cohler (former VP of Product Management and one of the first five emploees of the company)
• Ben Ling (former Director of Platform Product Marketing and a high profile Google hire)
• Jeff Hammerbacher (former lead of Facebook's "Data" team)
• Dustin Moskovitz (co-founder)

If you combine the list above with the New York Times article, The Facebooker Who Friended Obama which states

Mr. [Chris] Hughes, 24, was one of four founders of Facebook. In early 2007, he left the company to work in Chicago on Senator Obama’s new-media campaign. Leaving behind his company at such a critical time would appear to require some cognitive dissonance: political campaigns, after all, are built on handshakes and persuasion, not computer servers, and Mr. Hughes has watched, sometimes ruefully, as Facebook has marketed new products that he helped develop.

That's three departures from people named as co-founders of Facebook. Of course, it isn't unusual for co-founders to leave a business they helped start even if the business is on the path to being super successful (see Paul Allen) but it is still an interesting trend nonetheless.

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