Cyber Monday Set a New Record With $733 Million in Online Spending.

Amazon and Wal-Mart Top Online Retailers in Cyber Monday Visitors

U.S. online shoppers spent a record $733 million in a single day on "Cyber Monday," according to market research firms.

Cyber Monday is the first Monday after Thanksgiving and is considered the start of the online holiday shopping season when consumers return to work and seek deals not found in bricks and mortar retailers.

The spend was 21 percent up on the same day last year.The number of online buyers rose 38 percent from a year ago while the average dollar spend per buyer slipped 12 percent partly due to deep discounting.

The most interesting thing is that 60 percent of the money spent on Cyber Monday came from work computers.

The research data also showed that 44 percent of Internet users shopped online during Cyber Monday.

The most trafficked sites included those belonging to Amazon.com, Wal-Mart Stores Inc, Target Corp, Dell Inc and Best Buy Co Inc, comScore said.