US Mobile Search Ad Spending, 2011-2017 [CHART]
Desktop search volume declined for the first time, while the share of queries from smartphones and tablets reached roughly 20%.
Impressive as the growth has been, the results are more noteworthy: US marketers that ran tablet- or smartphone-targeted search campaigns in 2012 saw clickthrough rates (CTRs) well above desktop averages, while cost-per-click (CPC) rates were below desktop norms. In 2013, eMarketer estimates US mobile search ad spending will top $3.5 billion and represent 18% of digital search ad spending, up from 11% in 2012. Read the rest at eMarketer.