85% of consumers polled find online reviews important while making a purchase
The move puts pressure on Walmart, Amazon, and Best Buy, all of which now have higher minimums.
That's up 12%, according to Adobe, and represents nearly one third of annual Internet retail sales.
Mobile engagement surged to new heights, but the desktop PC is still the king of online purchases, according to IBM.
Both Walmart and Toys R Us dropped prices after Black Friday and raised them after Super Saturday. But Amazon held steady throughout.
Mobile transactions rose 20% and were four times more likely to be made on iOS devices versus Android.
Tiffany, Hot Topic, and Macy's follow close behind for social marketing skills. Needing more polish are 7-Eleven, Guess, AutoZone, and Coach.
Prime Now offers Prime members in Manhattan free two-hour delivery or one-hour service for $7.99.
Amazon led online retail's holiday surge, along with other third-party marketplaces like Google Shopping and Newegg.
Average order sizes fell 3.5% on the biggest day of the year for Web sellers, but legions of consumers willing to buy via mobile sent total sales up nearly 9%.