The sharing economy and innovative tech platforms have spawned some of the most exciting unicorns in the world, and they're not in Silicon Valley. What unique elements—economic, geographic, social or financial—converged to drive each founder of these four international start-ups to launch? And what unique challenges do they face? How do tech start-up cultures in Asia and Europe differ from those in "the Valley" and other world innovation hotspots? Tune in to a lively comparison and contrast of styles, methods. and rules of four companies that have the potential to change their industries.