I happened to write a mobile app using Exponent few days ago. It was a great framework.
During the course, I joined their official Slack channel and asked a few questions, talked to several Exponent devs who are very friendly and supportive
The conversation was something like this
It was a few weeks ago, now I read this article http://fortune.com/2016/08/23/charlie-cheever-y-combinator/
The guy co-founded Quora