Spending on mobile advertising in the US soared 89 per cent to $15.5bn in the first half of the year, taking up nearly half of online ad budgets, new data show. Mobile makes up 47 per cent of all online ad expenditures — up from 30 per cent a year ago and far surpassing the 19 per cent share taken by banner ads, according to a report from the Interactive Advertising Bureau and PwC, the professional services firm.
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