Via @eMarketer, #Amazon's net US #digitalad revs +23.5% Y/Y to $12.75B, $AMZN's share of US #digital ad mkt = 9.5%, +1.7% Y/Y. #digitalmarketing #ecommerce #mcommerce #retail #retailmarketing #digitaladvertising #PPCMarketing #SEO #SEM $GOOG $FB $MSFT