Uber — What’s Fueling Uber’s Growth Engine? (growthhackers.com)

Word of mouth

awesome

Note: OP is asking for upvotes for this story on Twitter.

https://twitter.com/SeanEllis/status/392797877514162176

http://i.imgur.com/AaMLcUp.png

Asked followers who enjoyed the article to help it get discovered on Hacker News. Removed tweet. OP

Excellent research!