Consumers spent $3.34 billion shopping online on Friday, a 21.6 percent increase from the same day last year, according to Adobe, which tracks online retail transactions.

More than ever before, shoppers used their mobile devices to dial up deals online, the firm said, as mobile purchases surged 33 percent on Black Friday to $1.2 billion.

Retailers also racked up online sales on Thanksgiving Day and the day before, the latest evidence that consumers are increasingly turning to online shopping as an alternative to wading into malls packed with holiday season bargain-hunters.

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