Jack Dorsey will spend up to half of 2020 on the continent
                                
                                
                                    (Newser) -
                                    Jack Dorsey is moving to Africa. The Twitter and Square CEO announced his plan in a Wednesday  tweet  after wrapping up a nearly three-week tour of the continent, with stops in Ghana, Nigeria, Ethiopia, and South Africa. "Sad to be leaving the continent...for now," he wrote, adding,...