It seems that Americans had their fill of turkey last week and quickly moved on to holiday shopping. New data from comScore reveals that U.S. online holiday spend showed significant year-over-year increases both on Thanksgiving and Black Friday.

According to the report, ecommerce spending on Thanksgiving hit $407 million. Turkey Day online shopping increased by 28 percent this year over last, when it hovered at $318 million.

While some Americans flocked to early morning Black Friday store openings, it seems many made purchases without ever leaving home. Online holiday shopping the day after Thanksgiving hit $648 million – a 9 percent increase over 2009. This makes Black Friday the biggest shopping day of 2010 so far, reports comScore.

The increases in online spending correspond with Brafton's earlier report that eMarketer predicts internet shopping will rise dramatically this year. The firm anticipates that 2010 retail ecommerce will exceed $38 billion, and internet marketers should be prepared to cater to savvy online shoppers with socially targeted promotions.

Today, Cyber Monday, presents the next major event in online holiday shopping that marketers can use to gauge the efficacy of their holiday campaigns. As Brafton has reported, Shop. anticipates that 70 million Americans will shop online while at work today – and this doesn't account for internet users who will shop from home.