The exodus at Yahoo continues. Cameron Marlow, a leading light of Yahoo Research, has left its Berkeley building, as we noted — but we can now reveal his destination: Facebook. That Yahoo tried to acquire the social network last year for a fraction of its current $15 billion price just makes his departure more bitter. Marlow, you see, had developed one of the most intriguing social networks at Yahoo — Tagsona, an internal tool for finding coworkers at Yahoo working on similar projects. Tagsona has already inspired social features in Yahoo products — but, alas, its inventor will be cooking up new ideas at Facebook, not Yahoo.

Andy Baio, the entrepreneur who created group calendar site Upcoming.org 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, Del.icio.us 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.