* Holiday spending online up 14.7 percent
* Mobile platforms make up 52 percent of online traffic
* Cyber Monday 2017 was biggest U.S. shopping day ever
Jan 16 (Reuters) - U.S. shoppers spent a record $108 billion snapping up discounts on Amazon and other websites during the 2017 holiday season, with more people using smartphones and tablets, Adobe Analytics said on Tuesday.
Adobe, which collects its data by measuring 80 percent of all online transactions from the top 100 U.S. web retailers, said the amount was 14.7 percent higher than last year's total.
Mobile platforms made up 52 percent of traffic to retail websites during the November-December period and were responsible for a third of all online spending.
With $6.6 billion spent, Cyber Monday the Monday after the Thanksgiving holiday was the largest U.S. shopping day ever.
Nintendo's Switch gaming console, Google's Chromecast, Roku, Hatchimals and Colleggtibles toys and Amazon's Echo speaker were Cyber Monday's top sellers, Adobe Analytics said.
Many brick-and-mortar retailers have spent heavily to move online and improve their delivery services, as people increasingly desert malls and shop online.
U.S. holiday spending across both online and physical stores rose 5.5 percent the most in 12 years to $691.9 billion, the National Retail Federation said on Friday.
The figures point to an improving job market and expectations of higher wages and bonuses after the recent tax bill.
Target Corp and Kohl's Corp last week reported strong holiday sales and raised their earnings forecasts as investments in e-commerce paid off.
However, department store chain Macy's Inc's holiday sales rose only modestly and the company said it would close stores and slash thousands of jobs this year. (Reporting by Uday Sampath and Siddharth Cavale in Bengaluru; editing by Sai Sachin Ravikumar)