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Quote:Caterina Fake knew she was onto something when one of the engineers at her Vancouver, British Columbia-based online game start-up created a cool tool to share photos and save them to a Web page while playing.

"It turned out the fun was in the photo sharing," she says.

Fake scrapped the game. She and her programmer husband, Stewart Butterfield, transformed the project into Flickr. In less than two years, the photo-sharing site — now owned by Internet giant Yahoo — has turned into one of the Web's fastest-growing properties...