I didn't develop React, I just use it at Facebook. I started Javascript development at Microsoft where we were using mostly our own homegrown stack on www.so.cl

I didn't develop React, I just use it at Facebook. I started Javascript development at Microsoft where we were using mostly our own homegrown stack on www.so.cl. When I moved to Facebook, the entire project I'm working on is in React. Since I haven't built many single page apps in my spare time, I have had very little exposure to Backbone. Rest assured the React devs certainly are familiar with most of the Javascript frameworks out there ;)