45% of Yelp's search queries come from mobile devices

"Yelp said that 36% of ads shown in Q1 were on mobile devices. The Yelp app was used on “10 million unique mobile devices” monthly in Q1. Although there are many more PC users globally (102 million monthly), approximately 45% of Yelp’s search query volume is now coming from mobile."

Source:  Yelp Q1 2013 results, reported by Screenwerk blog, 1st May 2013