Matt Lindner says, “E-commerce sales in the fourth quarter increased 18.2%, and comScore reports sales on mobile devices accounted for nearly 21% of online sales in that period.Online shoppers in the United States spent significantly more on their mobile devices during the 2016 holiday season and during the fourth quarter of 2016 as a whole, according to a just-released report from web measurement firm comScore Inc.Shoppers spent $22.7 billion via their mobile devices during the fourth quarter, up 45.5% from $15.6 billion in Q4 2015. That growth helped push total online sales (desktop and... [...]