Time spent on mobile platforms just keeps on rising, In fact, comScore reports that mobile now accounts for 69 percent of U.S. digital media time, and smartphone apps alone account for half of all digital time spent. With consumers spending more time than ever on mobile platforms, mobile commerce is now major contributor to overall e-commerce numbers. eMarketer estimates that mobile's share of US.online sales will reach nearly 50% by 2020. In other regions the figure is already well above that.