A more than 70% year-over-year increase in paid-search spending on smartphones and tablets compensated for a 12.5% decline in spending on desktop-focused efforts during the second quarter, according to The Search Agency. Cost per click on Google rose 8.3% from the same period in 2012 but increased 21.2% compared with Q1. Overall, the click-thru rate dropped across all devices, but Google turned around smartphone CPC in Q2, posting an increase of 23.8% compared with Q1. The desktop CTR on Bing declined 18.2% from Q1 to Q2.

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