Elon Musk's mass layoffs at Twitter have begun, with the company warning staff to brace for firing notices by email as it temporarily seals all its offices. The company said in a memo on Thursday night that all employees will receive an email alert by 9am Pacific time Friday letting them know whether they still have a job at the company. Twitter said its offices will be temporarily closed and all staff badge access will be suspended in order 'to help ensure the safety of each employee as well as Twitter systems and customer data.' 'If you are in an...