Presumably, Tumblr also uses Scala for the services themselves... and by assuming Scala, they can make the API more idiomatic. (For me, the question runs the o

Presumably, Tumblr also uses Scala for the services themselves... and by assuming Scala, they can make the API more idiomatic. (For me, the question runs the other way -- I need a very good reason to write a codebase in Java vs. Scala these days, although I understand not everyone feels the same.)