Why Google as serch engine??why not yahoo,amazon,answers,ask...

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We must have seen that,google had a great improvement and it is now touching skies.having great profits.broke the record of microsoft being the most visited site of the world. It has an well known search engine.who ever wanted to search anything in the web,writes up google on the navigation bar. It has also done a lot with adsense.Google is now the best internet advertising ways.but why dont we use ask.com,amazon.com,answers.com???