Shoppers spent a whopping $10.8 billion online on Black Friday, according to Adobe Analytics. The total for Cyber Week could be nearly four times that amount.

Sales at brick-and-mortar stores grew just 0.7 percent year-over-year, according to preliminary estimates by payments processor Mastercard, and were lower according to data firm F

Black Friday spending in U.S. retail stores was muted this year in contrast to a more robust rise online, as bargain-hungry Americans skipped stores in favor of their phones and laptops, according to data from Mastercard and other data providers.