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New York -- Cyber Monday online sales are up 17.5% over the same period last year as of 6 p.m. EST on Monday, according to IBM Digital Analytics Benchmark.

Mobile traffic accounted for 29.4% of all online traffic, up almost 62% compared to the same period last year.

In other findings from IBM:

U.S. shoppers made Cyber Monday the biggest online shopping day in history with a 20.6% increase in online sales, according to the latest cloud-based analytics findings from IBM. Mobile sales led the way, exceeding 17% of total online sales, an increase of 55.4% year-over-year.  

Cyber Monday also capped the highest five-day online sales period on record — from Thanksgiving Day through Cyber Monday — which grew 16.5% over the same period in 2012.

Armonk, N.Y. - Shoppers made Cyber Monday 2013 the biggest online shopping day in history with a 20.6% increase in online sales. The latest cloud-based analytics findings from IBM show that mobile sales led the way, exceeding 17% of total online sales, an increase of 55.4% year-over-year.

Cyber Monday also capped what IBM data indicates is the highest five-day online sales period on record from Thanksgiving Day through Cyber Monday, which grew 16.5% from the same period in 2012.

New York -- Overall online sales from Thanksgiving through Sunday were up 14.5% in 2013 over the same period last year, according to IBM Digital Analytics Benchmark. Mobile traffic accounted for 40.9% of all online traffic, up more than 35% percent compared to the same period last year. Mobile sales remained strong, reaching 23.2% of all online sales, up 43.7% year-over-year.

In other findings:

Chicago -- A majority (88%) of retailers are using social media as part of their 2013 holiday marketing blitz. But they still remain divided about mobile marketing, with only 38% using it this year, down from 50% in 2012.

Armonk, N.Y. – Online sales on Monday, Nov. 26 were up nearly 12% from the equivalent Monday a year earlier. Data from the IBM Digital Analytics Holiday Benchmark shows that mobile traffic accounted for nearly 32% of all online traffic, up 42% compared to the same period last year.   

Online sales early this week were up nearly 12% from the equivalent Monday a year earlier. Data from the IBM Digital Analytics Holiday Benchmark shows that mobile traffic accounted for nearly 32% of all online traffic, up 42% compared to the same period last year.   

Thanksgiving holiday sales are not getting much social promotion this year from retailers. According to an analysis of 494 brand posts from eight retailers by social software company Expion, only 10 focused on Thanksgiving holiday sales (Thanksgiving Day, Black Friday, Cyber Monday), or just 2% of all brand posts, and only five of the eight retailers posted about holiday sales.