Online accounted for 19.5% of global advertising expenditure in 2012 and is predicted to rise to more than 21% this year, according to a report from GroupM.
Digital advertising spend reached $99bn worldwide in 2012, a 16.2% increase year-on-year. This figure is predicted to grow by 14.6% to $113.5bn in 2013.
North America was the leading digital ad market in 2012, worth $38.3bn, followed by Asia Pacific on $30.6bn and Western Europe on $24.1bn.
Ecommerce generated an estimated 40% of online paid media ad investment.