Yahoo's web sites attracted more U.S. visitors than Google during July for the first time since May 2011, indicating that turnaround efforts by Chief Executive Officer Marissa Mayer are gaining traction. More than 196,564 million Web users spent time on the largest U.S. Web portal's sites during the month, up 21 percent from a year earlier, ComScore said in a statement yesterday. That's 4.3 million more than Google.

Marissa Mayer has been pushing Yahoo's developers and designers to make improvements to the company's products and services since she was hired in July of last year from Google.