Foursquare[1], Twitter[2], LinkedIn[3] and The Guardian[4] use Scala.

If you are looking for code examples, you can explore here:

https://github.com/languages/Scala

I have been using Scala lately for some personal stuff and I've really fallen in love with it.

[1] - http://www.scala-lang.org/node/5130 [2] - http://www.artima.com/scalazine/articles/twitter_on_scala.ht... [3] - http://www.scala-lang.org/node/6436 [4] - http://www.scala-lang.org/node/7808