As a companion piece to the comScore report Monday that Americans have spent a record $18.7 billion online so far this holiday season -- up 15% from last year -- consider this chart from Compuware APM showing the relative contributions of the two leading platforms for what it calls "couch commerce": Apple's (AAPL) iPad and iPhone.
Together, according to an earlier IBM study, the two devices accounted for 10.2% of Black Friday's online retail traffic.
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