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A former Twitter exec said he and Elon Musk used to swap ideas for the site late at night. Behnam Rezaei, Twitter's head of product and engineering, said he left Twitter this week. Rezaei said in a tweet that he and Musk discussed "product ideas or bugs" at 3:00 a.m.One of the last remaining executives from Twitter 1.0 says he and new owner Elon Musk used to exchange ideas for the...