Hitwise reported that Google's market share in the US was 72.11% in February. "Yahoo Search, MSN Search and Ask.com received 17.04%, 5.56% and 3.74%, respectively, and are down year-over-year at -17%, -20%, and -10% respectively." comScore has different numbers and they show that Google's market share in the US is much lower: 63.3%. A report from the AT Internet Institute shows that Google's mar..