It was a spectacular Cyber Monday! And it was the biggest online shopping day in history according to IBM (s IBM), which tracks online retail via its Digital Analytics service. There was a 20.6 percent increase in online sales, with the biggest boost coming from mobile,which accounted for over 17 percent of total online sales, up 55.4 percent from 2012. Mobile traffic was 31.7 percent of all online traffic, up 45 percent over 2012. The five-day online sales period – from Thanksgiving Day through Cyber Monday — was the highest ever in terms of spending. It was 16.5 percent over the same period in 2012. IBM didn’t share actual dollar figures on amount of money spent.