US retail e-commerce spending for the first 46 days of the November-December 2011 holiday season reached $30.9 billion, up 15% from the corresponding days in 2010, according to data from comScore.

Online retail sales surpassed $1 billion on four out of the five days of the previous business week ( Dec 12-16), led by Green Monday (Dec 12) with $1.13 billion and Free Shipping Day (Friday, Dec 16) with $1.07 billion.

"More than $1 billion in spending on Free Shipping Day put the exclamation point on what will almost certainly be the heaviest week of the online holiday shopping season," said Gian Fulgoni, comScore chairman.

"While next week may see another strong day or two at the beginning of the week, it’s clear that we have now reached the crescendo for this season and that spending will begin to slow as we get closer to Christmas, leaving Cyber Monday as the top ranked shopping day for the second year in a row."

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