Initial Twitter service was built using Ruby on Rails, shifting to Scala on the JVM around 2011-2012. See: https://www.infoq.com/articles/twitter-java-use/ htt

Initial Twitter service was built using Ruby on Rails, shifting to Scala on the JVM around 2011-2012. See: https://www.infoq.com/articles/twitter-java-use/ https://www.infoq.com/articles/twitter-java-use/ https://carlosbecker.com/posts/twitter-drops-ruby-bullshit/ https://carlosbecker.com/posts/twitter-drops-ruby-bullshit/ https://blog.twitter.com/engineering/en_us/a/2011/twitter-search-is-now-3x-faster.html https://blog.twitter.com/engineering/en_us/a/2011/twitter-se... for a sampling of explanations.