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FWIW Twitter and Coursera make heavy use of Scala (Twitter also uses Clojure, if you consider Storm etc.)

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Scala is running on top of JVM (right now).

It is used in production by Twitter, Netflix, Foursquare, LinkedIn, Simple, HealthExpense, Klout, 47 Degrees, Box and a long list of other companies [1].

[1] http://www.quora.com/Startups/What-startups-or-tech-companie...