Nielsen Online yesterday released its rankings of U.S. search share for December. Overall search increased 19.6 percent year over year to 8.6 billion searches. Google had year over year increase of 33.5 percent and received 62.9 percent of searches. Yahoo had a year over year increase of 13.7 percent and received 16.8 percent of searches. Microsoft had a year over year decrease of 15.5 percent and received 9.8 percent of searches.