• by Mark Walsh  @markfwal, November 29, 2011

Holiday online spending hit $1.25 billion on Cyber Monday, making it the heaviest e-commerce shopping day in history and only the second day on record to break the billion-dollar threshold. The figure also represented a 22% gain from last year, according to new data from comScore.

That growth was driven by an increase in both the number of buyers (up 11%) and the average spending per buyer (up 9%). Overall, 10 million people made purchases online on Cyber Monday, another e-commerce record for a single day. The average online buyer spent a total of nearly $125 across two transactions.

Half of dollars spent online at U.S. Web sites originated from work computers, up slightly from last year. Buying from home comprised the majority of the remaining share (43.2%), while people visiting U.S. retail sites from abroad accounted for 6.6% of sales.

For the holiday season through Nov. 28, online spending has reached $15, marking a 15% increase from the year-earlier period.