Experian Hitwise has released May 2012 search engine market share figures. It's no surprise that Google retains the largest overall share in the U.S. at 65%. Bing-powered search comprised 28% of searches, 5% year-over-year. The remaining 65 search engines accounted for 6% of U.S. searches. One-word searches comprised the majority of searches in May 2012, amounting to nearly 30% of all queries, and have increased 19% year-over-year.