Bebo founders Michael and Xochi Birch cashed out in the nine figures with the social network's $850 million purchase by AOL. According to the invite for their farewell party, they'll be retiring to a humble, quiet cabin (which, in the Bay Area housing market, should set them back a million or two). What they aren't spending their windfall on?

Hot air balloon rides and circus performers. But then it would be difficult to fit either into 1015 Folsom, where the party is being held tomorrow night. As for the rest of Bebo's original employees? They've all left already.