If you go to an individual company's page, you'll see references which may include a post/article about why they chose x over y. Tumblr's tech stack page (http:

If you go to an individual company's page, you'll see references which may include a post/article about why they chose x over y. Tumblr's tech stack page (http://stackshare.io/tumblr/tumblr http://stackshare.io/tumblr/tumblr) has an article about why they chose Scala over other options and it's pretty neat.