From Internet News, “Who’s Really Winning the Search Race“:
Yet, as it turns out, the big players aren’t the ones seeing the most growth in search. Instead, it’s Craigslist that leads in percent growth according to comScore. The online classifieds site posting a 12 percent jump in queries from 583 million to 651 million from April to May.
Here’s the data, with search queries denominated in millions: