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LinkedIn, Twitter, Netflix, Tumblr, Foursquare, Tumblr and AirBnB are using Scala for product development. LinkedIn Signal is built on the shoulders of Scala and JRuby. Netflix borrows Groovy and Java code to rework it in Scala and add interactive elements to the service. Twitter engineers have built up a collection of custom libraries and made current development more streamlined for themselves. Twitter jokes that they probably employ half of the world’s Scala experts and the other half is likely academics.