Online sales for Black Friday and Thanksgiving surged to record highs in the US this year, pushing Amazon founder Jeff Bezos’ net worth to $100.3bn, according to Bloomberg estimates.

Retailers in the US brought in a record $7.9bn in online sales on Black Friday and Thanksgiving, up 17.9% from a year ago, according to Adobe Analytics, which measures transactions at the largest 100 US web retailers.

Adobe said Cyber Monday is expected to drive $6.6bn in internet sales, which would make it the largest US online shopping day in history.

Commerce marketing firm Criteo said 40% of Black Friday online purchases were made on mobile phones, up from 29% last year.

TVs, laptops, toys and gaming consoles - particularly the PlayStation 4 - were among the most heavily discounted and the biggest sellers, according to retail analysts and consultants.

The online sales boom caused Amazon's online purchases to increase by more than 18% since last year, according to data from Adobe Analytics, as shares at the online retail giant jump more than 2%.

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