Tech U.S. mobile ad spending could surge past $110 billion by 2020: A Foolish Take October 30, 2018Leo Sun, The Motley FoolComments Off on U.S. mobile ad spending could surge past $110 billion by 2020: A Foolish Take American adults could spend more time on mobile devices than watching TV for the first time in 2019, according to a recent eMarketer study.