Joel Xu, 25, drives in Shanghai for People's Uber, a ride-sharing service. He makes about $4,000 a month – a good wage in Shanghai – and loves meeting new people he'd otherwise never encounter. Frank Langfitt/NPR hide caption

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Lyft driver Danielle Kerley showcases the company's iconic mustache, which is displayed on cars used in the service. Aarti Shahani/NPR hide caption

toggle caption Aarti Shahani/NPR