Google has avoided legal action in the US after regulators failed to produce any evidence it manipulated search results to favour its own products.
The Federal Trade Commission (FTC) found no wrongdoing at the end of a 19-month investigation into claims the search engine put its own products high up in results for terms such as "hotels" and gave competitors a lower ranking so customers cannot find them.
But in a concession, the Californian firm promised to give advertisers access to more information about their campaigns and not to use other providers' material such as product reviews in its search results.
FTC chairman Jon Leibowitz said: "Even though people would like us to bring a big search bias case, the facts aren't there." Social networking website Yelp said the decision was a missed opportunity to protect internet innovation.
Google is also making changes to how it uses patents it bought from its purchase of Motorola Mobility last year.
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