Tablets and smartphones are predicted to be between 16 percent to 22 percent of all paid search share in the US by the end of 2012.

Mobile spend is 6.5 percent of all search spend, up 2.7 times (270 percent) from a year ago, according to Efficient Frontier. The company announced the release of new data on the mobile search industry published in a report from Macquarie Group.

Key findings:

• Mobile spend is 6.5 percent of all search spend, up 2.7 times (270 percent) from a year ago.
• Return on Investment (ROI) for search on mobile devices has climbed rapidly in 2011 but remains less than half of traditional desktop search.
• Tablet usage has increased substantially and is now half of all click share on mobile devices and conversion rates on tablets are now comparable to that of desktop search.
• Tablets have made major inroads in retail where 77 percent of all mobile traffic is coming from tablets.

Demonstrating momentum in the tablet market, tablets took up 43 percent of the mobile device spend share in the last three months from August to October 2011.

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