> Look at the greatest companies that have come out of Silicon Valley over the last several decades, Facebook started on PHP and Google on C++. The software i

> Look at the greatest companies that have come out of Silicon Valley over the last several decades, Facebook started on PHP and Google on C++. The software innovations that these companies brought to the world didn't happen in the start up phase but years later, once they had grown sufficiently big that they had resources to devote to R&D in an effort to streamline and optimize their existing infrastructure. I talk to a lot of startups on a daily basis, most of them are either built on Java or Ruby on Rails. I don't see any of them building their v1 with Clojure, Kotlin, Ceylon, Idris or Ermine or any technology created in the past five years.