Online shoppers in the US racked up $733 million (about £367m) in purchases on 'Cyber Monday', the first Monday after the Thanksgiving holiday. According to comScore Networks, the figure - a 21 percent increase over the same day last year - is a record for single-day sales online.
Online shoppers have spent $10.74bn (about £5.3bn) in total so far this holiday season, which comScore measures from 1 November. That's 17% more than during the same period last year.
Cyber Monday is the first Monday after the US Thanksgiving holiday, when people return to work and begin making online purchases, as opposed to bricks-and-mortar store purchases they may have made on "Black Friday" – the day after Thanksgiving.
Online stores have been struggling to keep up with the demand. On Monday, internet performance analysis company Keynote Systems said 10 of the 30 major retail sites it monitors for its holiday retail index showed significant slowdowns.
The total number of online shoppers was up 38% this year, comScore said, although it noted an average decrease in spending of 12%.
Overstock.com and Circuit City's website were the two hottest sites compared to normal traffic, each experiencing jumps of over 130%. In contrast, Amazon.com visits were up a more modest 50%, while Apple saw a 5% bump for its online store.