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Upper left: In 1994, HotWired.com ran the first banner ad, Yahoo says in a retrospective on its Web site.
Upper right: In 1996, Yahoo goes global, with sites catering to Canada, Japan and the United Kingdom and Ireland.
Lower right: Yahoo goes public in 1996. Pictured here are co-founders David Filo (left) and Jerry Yang.
Lower left: Also in 1996, Yahoo Maps is launched.
Credit: Yahoo, from its birthday retrospective