On: Everything is not equally good

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"Everything is not equally good." For example, Ruby on Rails is not equally as good as Scala[1].

[1] twitter dot com

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Twitter still uses Ruby on Rails to generate the website, as always. Their use of Scala is on the backend; the services that lay behind the Rails app. Facebook uses a similar architecture behind their PHP code, using many other languages, including Java.

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If that's still true, it won't be for very long.

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It's been the case for three years now. Why would you expect change very soon?

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Which one? Twitter/Rails or Facebook/PHP and why not?

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Almost no one is facing the same issues as twitter. I find it extremely unlike that DHH thinks Rails is best for every possible scenario, and a single counterexample of an extreme outlier isn't an argument against this.