cagraham writes: According to IBM's latest Data Benchmark report, 21.8% of all online Black Friday sales were made from mobile devices. Mobile traffic, meanwhile, accounted for 39.7% of all Black Friday traffic. Interestingly, iOS users accounted for 18.1% of online sales, while Android users accounted for just 3.5%. The data come from IBM's real-time monitoring over 800 U.S. online retailers. The report also notes that tablets generated less traffic than smartphones, but accounted for almost twice the number of sales. Overall, online sales for Black Friday grew 18.9% year-over-year.