Dive Brief:

• Nearly 57% of time spent online in December 2013 was time spent on mobile devices, compared to 26.2% three years before, according to a report,"U.S. Digital Future in Focus 2014," by digital analytics company comScore Inc.

• The shift comes from what comScore calls the new “multi-platform majority.” Only 36% use a desktop computer exclusively and only 8% use mobile devices exclusively.

• Time spent using tablets increased 1,040%, using smartphones 237%, and using desktops 7%, according to the report.

Dive Insight:

The fact that more people are spending more time on mobile devices may not come as much of a surprise, but the colossal size of the increase may be. Websites optimized for desktop computers must operate as smoothly and efficiently as ever, but retailers should keep in mind that mobile is increasingly where consumers are spending their time accessing their sites and apps, or trying to.