Via @eMarketer, top 10 US #ecommerce #retailers 2 grow 21.8% in 2020 - #Amazon 2 gain US ecommerce share, #Walmart 2 rise 2 #2 4 1st time. #digitalmarketing #mcommerce #retail #retailmarketing #mobile #mobilemarketing $AMZN $WMT $TGT $BBY $M $KSS $JCP