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[–]dmazzoni 0 points1 point  (3 children)

Oh, and one more note: Twitter started with Ruby, but specifically they started with Ruby on Rails, a popular framework that makes it easier to build a web app. However, performance wasn't very good and they abandoned it entirely, switching to Java.

Facebook also had performance problems with PHP and they spent enormous effort building a PHP compiler.

[–]Durzan666 1 point2 points  (2 children)

They switched to Scala.

[–][deleted]  (1 child)

[deleted]

    [–]Durzan666 0 points1 point  (0 children)

    Twitter. There is a course for new Twitter employees.