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When Google came out and said that Microsoft's search engine Bing was copying its results, many were not surprised. Only when side-by-side comparisons were made did it become clear that Google may have been right.
Microsoft said that it had not copied results, but Google had already set up the 'Bing sting' which was designed to prove that Microsoft had done so. It turned out that indeed Bing had been copying search results by "watching" what people search for on Google -- the search giant said.