Online ad revenues across the Atlantic exceeded $5.2bn (£2.5bn) in Q3, making it another record quarter, according to the Interactive Advertising Bureau.
Spending on online ads increased by $1.1bn (£532m) or 25.3% on the same period last year, and also rose by 3% compared to Q2.
Online advertising spend will grow faster in Canada than anywhere in the world over the next four years, according to a heavyweight new PricewaterhouseCoopers report.
PwC's Global Entertainment and Media Outlook, which looks at the international media industry between 2007 and 2011, forecast the amount of money advertisers spend online will grow to US$2.03bn (£1.02bn) by 2011.