Chart - US Mobile Search Advertising Metrics By Device

Search advertising spending on tablets increased by 113% year-over-year in Q1 2013, representing 64% of mobile search spend, per results from a new IgnitionOne study. Smartphones also saw strong spending growth (+112%), with both devices cannibalizing PC budgets, as overall paid search spending increased by only 2%. For the quarter, tablet users spent an average of 17% more time on site than PC users.

They also sported an Engagement Score that was 9% higher than for PC users. (Engagement Score is a proprietary IgnitionOne metric that measures behavior and propensity to convert on a relative scale.)

Smartphone users accounted for a larger audience than tablet users, but showed lower overall engagement than tablet users relative to PCs. Smartphone users spent 4% more time on site than PC users, but had an Engagement Score that was 14% lower. Read the rest at MarketingCharts.