Yep, by a huge margin. As of mid-2012, Google has 900 million unique monthly visitors. Bing and Yahoo! are the second and third most popular, with Bing just recently overtaking Yahoo!, but they each have "only" about 165 million unique monthly visitors. Ask.com isn't that far behind, with 125 million unique monthly visitors. (And in case you're curious, AOL Search rounds out the top 5, with 33 million unique monthly visitors.)
