Cofounders, Flickr
Ages: 33 (Butterfield), 37 (Fake)
Two years after Yahoo bought their photo-sharing site, Butterfield and Fake's Flickr is stronger than ever, with 3 million members sharing over half a billion photos. And it's not clear who's taking over whom: Butterfield recently saw Yahoo Photos closed in favor of Flickr. And Fake, his wife, is heading up an in-house incubator to come up with more entrepreneurial inspirations. Ages: 33 (Butterfield), 37 (Fake)
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