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Flickr Co-Founder Butterfield and Chief Architect Henderson Working on Stealth Start-Up

Kara Swisher in News on April 30, 2009 at 2:48 am PT

Yesterday, several Flickr engineers posted news of their layoffs from the Yahoo photo-sharing unit on Twitter, which caused GigaOm’s Om Malik to notice that Flickr architect Cal Henderson was also no longer on its About page. According to several sources I spoke to, Henderson was actually not laid off at Yahoo, but is leaving to start a new company–in the social-gaming arena, I am told–with Flickr co-founder Stewart Butterfield. He and several other of the original core development team for Flickr transitioned out or have been transitioning out for quite some time, sources said.