"Yahoo has taken over the top spot in comScore's Ad Focus rankings as well with an 87.2% reach. That means that a page owned by a Yahoo site was viewed by 87.2% of the 225 million total web visitors in July. That is well ahead of Google's 80.6 percent reach. And that translates into higher ad rates and more revenue for Yahoo."
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Yahoo beats Google in US web traffic, shares rise - The Times of India