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Andy Baio, the entrepreneur who created group calendar site and sold it to Yahoo two years ago, is leaving the company. Not surprising that a company founder would leave after an acquisition, especially after two years, since that's a typical length of time for shares to vest under a deal's earnout provision. But Baio was part of a generation of startuppers brought in to transform Yahoo in the wake of that company's groundbreaking acquisition of Flickr — like, for example, founder Joshua Schachter, shown here rocking out with Baio. Schachter is still a presence at Yahoo. But what's most notable about the list of people Baio thanks in his farewell post are the ones who are no longer there — or are on their way out.

Paul Levine, the GM of Yahoo Local, the group in which Upcoming found a home, left earlier this year for AdBrite. Cameron Marlow, a much-respected thinker in Yahoo Research, is also leaving, we hear. And Flickr cofounder Stewart Butterfield, who played a large role in Upcoming's acquisition, is not leaving Yahoo, as we previously reported. Sources familiar with Butterfield's thinking now say he doesn't plan to go back to running Flickr after his current paternity leave, instead finding another role within Yahoo.

(Photo by Scott Beale/Laughing Squid)