Ex-Twitterer Blaine Cook soon out of YahooDoes Twitter miss former architect Blaine Cook, the technician who was simultaneously blamed for the site's outages and hailed for keeping it alive? We're guessing so, if only because Cook's long-haired mug still — still!gazes from Twitter's jobs page. Cook recently took a job at Yahoo's Brickhouse incubator. He was chummy enough with his coworkers to show up at a going-away party for departing Brickhouse chief Chad Dickerson. But Cook is apparently a short-timer there. A source reports Cook saying he couldn't wait for his contract to expire so he can leave around the end of next month. That's a brief stint, even for Yahoo.