U.S. online retail sales rose 17.4% on Thanksgiving Day, according an analysis by International Business Machines Corp. IBM+1.68% .
That was followed by a 20.7% increase in online Black Friday sales.
Mobile shopping jumped, with 24% of consumers using a mobile device to visit a retailer's site, up from 14.3% last year. Apple Inc.'s AAPL+1.74% iPad tablet generated more traffic than other mobile devices, with almost 10% of online shopping. The iPhone followed with 8.7%.
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