I quite enjoyed playing with Reason and would love to get a chance to use it for something at work. We use a ton of Scala on the backend here at Verizon Labs (so many of us are into hardcore FP) but we occasionally run into GC issues, so the OCaml runtime is something that could potentially mitigate that.

Can you talk about what FB uses Reason to develop, and what kind of services are being built with it?