New research from fledgling San Francisco firm Marin Software suggests search advertising is proving less profitable as people increasingly use smartphones and tablets to browse the web.Marin's data indicates the price firms like Google can charge companies in the UK for mobile promotions is less than half that for a desktop ad. On average a desktop click commands 32 pence but on a mobile it falls to around 15 pence. Tablet ads are worth roughly 28 pence per click. Continue reading

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