Not sure about the methodology here. In addition to having my own startup using Ember.js, I'm constantly meeting with other startups building their business on it:

* Discourse

* Travis CI

* Practice Fusion

* Nitrous.io

* Embedly

* Balanced

* Customer.io

* Addepar

Not sure if you count other places like Square or Zendesk as startups, but they're using it too. We've also seen big companies like McGraw-Hill Education start building out their next generation technology using it.

You can find a longer list of users here:

http://emberjs.com/ember-users/