Uber is updating its cab service app with a feature to let riders thank their drivers – with stickers. The new Compliments feature allows passengers to send stickers to their drivers after a ride, to thank them for excellent service, a clean cabin, ‘awesome music’ and for being entertaining, among other things. Drivers can find these stickers in a new section in their apps’ home screens. That’s nice enough, and it certainly adds a dash of color to the existing feedback system for passengers, but it seems like Uber could do more to help people show gratitude for a pleasant ride.…

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