The numbers continue to add up for mobile commerce. An analysis of the paid search spend of more than 1,000 advertisers in the fourth quarter, including retailers such as Macy’s Inc., No. 17 in the Internet Retailer Mobile Commerce Top 300, and Hotels.com, finds that the consumers are more likely to click on an ad on a search results page when using smartphones and tablets than when using desktop and laptop computers, says Marin Software Inc., an online advertising services and technology firm.

The smartphone click-through rate, which measures the number of clicks an ad receives against the number of times the ad is shown, was 1.25% in the fourth quarter of 2011. The rate for tablets was 1.31%. Desktops and laptops came in at 0.95%.

Tablets and smartphones garnered 4% and 6%, respectively, of the click share for the paid ads included in Marin’s “U.S. Online Advertising Report, Key Trends & Insights, October-December 2011.” While no year-ago data is available, mobile devices represented 5% of clicks on paid search ads in the third quarter, says Matt Lawson, Marin Software vice president of marketing.