Twitter CEO Jack Dorsey, left, and civil rights activist DeRay Mckesson, right, at the Code conference in Rancho Palos Verde, Calif. June 1, 2016.(Photo: Jefferson Graham/USA TODAY) RANCHO PALOS VERDES, Calif. — When Jack Dorsey left California to visit #Blacklivesmatter protesters in St. Louis, Mo. in the summer of 2014, employees were confused. At...