Is instrumental in Yahoo's turnaroundAfter joining Yahoo, a major challenge for Mayer was to pump new energy into the purple-hued Internet pioneer. Mayer has revamped many of Yahoo's core products, like Flickr, and has embarked on an ambitious acquisition spree — including the blockbuster $1.1 billion purchase of Tumblr — and returned hundreds of millions of dollars to shareholders.
Under her leadership, Yahoo also topped Google as the most-visited website in the United States in July. Yahoo received 196.6 million unique visitors during the month, compared with 192.3 million for Google. This was for the first time Yahoo has found itself in the top spot for U.S. Web traffic since May 2011. Yahoo's traffic does not include data from Tumblr, acquired by Yahoo earlier this year for $1 billion, says comScore.