59% of Yelp's searches are on mobile

"Yelp mobile:  Yelp mobile continues to grow rapidly.  In the second quarter, approximately 40% of local ads were shown on mobile devices, and approximately 59% of searches were on mobile, including mobile web and app.  Additionally, Yelp launched a number of mobile upgrades including the Nearby feature which suggests businesses and activities based on location, behavior, friends' activities, and other data."

Source:  Press release from Yelp announcing Q2 results, 31st July 2013

Earlier - 45% of searches on mobile in Q1