When Twitter hired Lee Mighdoll as VP of engineering and operations in January, cofounder Biz Stone called him the "perfect match" for the company. Not anymore. Mighdoll is out after just three months of the job. "The match was not perfect," Stone told SAI in an email. Mighdoll is the second engineer reported to have left Twitter in the last two days; architect Blaine Cook fled the country yesterday. Neither was able to fix Twitter's oft-reported propensity to crash. We hear the final straw to break Biz Stone's back was not the breakdown yesterday that TechCrunch described as a "privacy disaster". Makes sense, because isn't that Twitter's raison d'être?