Smartphone Search Ad CTRs (clickthrough rates) show potential as first-position search ads on smartphones account for 39% of clickthroughs (tablets 36% & desktops 30%). @eMarketer expects 40.7% of the US population will search via mobile devices in 2014, and 61.1% of the population by 2018. Hence, it estimates that US advertisers will spend $8.72B (38.1% of all digital search ad expenditure) on mobile search in 2014 and $25.69B (76.7% of all digital search ad expenditure) by 2018. - Link

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