Updated with final sales estimates from Adobe.

Cyber Monday held onto its title as the nation's busiest online shopping day by hitting a record of $3.45 billion in sales.

Black Friday had been on track to surpass it with its own record online sales of $3.34 billion, but Cyber Monday narrowly surged ahead. Adobe's final estimate of $3.45 billion spent on Cyber Monday beat its previous forecast of $3.34 billion. Sales were up 12.1% compared to the previous year. 

"This indicates that consumers still had more appetite for online shopping despite the incredible volume of online sales on Black Friday," said Tamara Gaffney, principal analyst at Adobe Digital Insights, in a statement.

However, mobile traffic and mobile sales on Cyber Monday fell just below the numbers for Black Friday. Cyber Monday saw 44% of consumers browsing deals on their smartphone or tablet and 31% of sales were generated on mobile, while about 55% of Black Friday consumers shopped on a mobile device and 36% of sales were from mobile. 

Additionally, iOS smartphone users spent more than Android smartphone users, with an average order value of $141 versus $128, according to Adobe.

The most-mentioned company on social media was eBay (EBAY) , followed by Amazon.com  (AMZN) , Macy's (M) and Walmart (WMT) , according to Adobe's data. Walmart experienced a record number of visits to its online business from the start of Black Friday through Cyber Monday. 

Amazon said on Monday it was on track to have its best Cyber Monday "in history," with the $50 Echo Dot being its best-selling item on Thanksgiving, Black Friday and Cyber Monday, according to CNet 

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