US mobile search ad spending grew 120.8% in 2013, contributing to an overall gain of 122.0% for all mobile ads. Meanwhile, overall desktop ad spending increased just 2.3% last year, according to eMarketer. eMarketer estimates that desktop search ad spending will drop $1.4 billion this year, a decrease of 9.4% from 2013, while mobile search will increase 82.3% year over year. Mobile search will total $9.02 billion, compared with $13.57 billion for desktop search. Overall, US spending on advertising served to desktops and laptops will decline 2.4% in 2014 to $32.39 billion, down from $33.18 billion in 2013. Google will have a notable influence on the overall shift from desktop to mobile search spending. In 2013, 76.4% of the company’s search ad revenues came from desktop. However, that share will fall to 66.3% in 2014 due to a $770 million decrease in desktop search ad revenues year over year, eMarketer estimates. At the same time, the company’s mobile search revenues will increase $1.76 billion, totaling approximately one-third of Google’s total search revenues. Key contributors to Google’s mobile search growth include its Enhanced Campaigns and Product Listing Ads (PLAs), both of which contributed to increased click share on mobile throughout 2013 and will continue to do so. Get the full story at eMarketer