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Mike Krieger

Mike Krieger

Cofounder, Instagram

Mike Krieger is the cofounder of social photo app Instagram, which dominates the world of mobile photography. While Krieger and his cofounder Kevin Systrom were repeatedly told their invention was just another photo app that would never succeed, Instagram caught on thanks to clever user interface and a focus on speed.

We showed it to some investors and they were like 'Ah, we're not interested. You know photos, that's kind of been done before.'