The first two days of the holiday sales period have netted $4.45 billion in U.S. online purchases, with mobile devices — led by smartphones — accounting for a record $1.5 billion of that amount, with $2.72 billion spent on BlackFriday and $1.73 billion on Thanksgiving. The figures come from Adobe, which has been tracking some 4,500 sites, including 80% of the top 100…
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