Growing internet usage will boost global internet advertising revenue to $81.1bn (£41.9bn) by 2011, according to new research from Piper Jaffray & Co.
The figure is more optimistic than a report by PricewaterhouseCoopers last year, which predicted that internet ad revenue would reach $51.6bn in 2010, based on an annual growth rate of 18.1%. Piper Jaffray's report predicts growth of 21%.