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Not sure of exact date, but Yahoo! was founded by David Filo and Jerry Yang in January of 1994.
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Google first debuted on September 4, 1998. Founded/Created by Larry Page and Sergey Brin.
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Created by Apple inc.
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Facebook first debuted February 4, 2004. Created by Mark Zuckerberg.
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Founded by Jack Dorsey, Noah Glass, Evan Williams, and Biz Stone.
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Created by Apple inc. With help by Steve Jobs.
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Help developed by Google.
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bing was debuted on June 3, 2009. It is created/owned by Microsoft (Bill Gates).
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Created by Apple, inc. And Steve Jobs.
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Developed by Facebook. Authors Kevin Systrom and Mike Krieger.