This year's holiday season is expected to see a bump in mobile commerce, along the lines of the increase seen last year, Chantal Tode writes. Last year, 16% of Black Friday sales were consummated on mobile. That proportion may increase to 20% in 2013, said Dave Haucke, a strategist at IBM Enterprise Marketing. "If you look at the trajectory of mobile commerce over the last two years, it has been growing something like 30% every year," he said. "If we grow another 30%, that puts us over 20% of online sales."