All Bruno Francois wanted to do was to make a viral app. The Atlanta-based entrepreneur did exactly that, and then he sold the resulting start-up — backed by Mark Cuban — to online used car-seller Carvana for $22 million. 1 success story" of all the start-ups to ever appear on ABC's "Shark Tank." But long before Francois hit on Car360, he was an entrepreneur looking to create the next viral app — a goal that would take him through multiple products. Then "I Googled 'How to promote an app,'" Francois now tells CNBC Make It while laughing.

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Persons: Bruno Francois, Mark Cuban, Francois, Carvana, Car360, he'd Organizations: Apple, University of Central, CNBC, Ventures, Francois, YouTube Locations: Atlanta, Phoenix, University of Central Florida