Mobile devices accounted for 26 percent of online sales, according to the Adobe Digital Index report, based on data from 200 million visits to 4,500 retail websites on what is traditionally the busiest day of the year for Internet shopping. Top-selling items included Lego Star Wars, the Barbie Dream House, Samsung 4k television sets and Apple Inc’s iPad Mini. A spike in online sales on the first Monday after the U.S.