When was the last time you gave a coworker a high five? If your company engages in e-commerce, you likely have reason to be high fiving the whole office (try not to leave anyone out), because Cyber Monday 2012 was ranked as the heaviest U.S. online spending day in history. Americans spent $1.46 billion last Monday, up a solid 17% from a year ago

The data comes from comScore, a global leader in measuring the digital world. So far, we’ve spent over $16.4 billion online this holiday season—up 16% from where sales were at last year.

The winning product category this year goes to Digital Content & Subscriptions, as you can see by the chart below.

Good news also for employers tired of workers shopping online during business hours. The chart below shows the slight drop that occurred in workplace shopping since last year’s Cyber Monday.

Sales using mobile devices were up, too. IBM reported a 70% increase from 2011 to 2012 in terms of shoppers using their mobile devices to make purchases. In total, IBM says that 18% of shoppers did so via mobile devices.

‘Tis the season to be jolly. And with online sales up, many businesses have another reason to enjoy the most wonderful time of the year.

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