What languages do twitter and facebook use? [closed]

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I'm using php for the last 6 months and i can pretty much do anything with it. But BIG websites like Facebook and Twitter don't appear to use php. I want to know what languages they use and why they chose that language over php.

Is Ruby on Rails a good language to build robust and big websites? I've seen RoR's video on youtube mocking other framew开发者_C百科orks and languages. Is it really awesome?

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• Twitter on Scala

It began its life as a Ruby on Rails application, and still uses Ruby on Rails to deliver most user-facing web pages. But about a year ago they started replacing some of the back-end Ruby services with applications running on the JVM and written in Scala

• Facebook Technology stack

Facebook’s technology stack consists of applications written in many languages, including PHP, C, C++, Erlang and others.

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twitter is built on Ruby on Rails

facebook uses PHP primarily, but also relies on "C++, Java, Python and Erlang" -- http://en.wikipedia.org/wiki/Facebook#Server_infrastructure

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At this point Twitter mostly runs on Scala (though with some Ruby on Rails thrown in) (cite).

Facebook runs mostly PHP, but also uses some C++, Java, Python and Erlang on the back-end (cite).

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I would say that this depend on how familiar are you with the language. Any language can be use to build robust and big websites

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Large website optimization is typically a matter of how you optimize database queries.

In terms of the language itself, you can always run PHP on more computers as they become saturated. Their isn't really anything that prevents PHP from working on large websites, it is more about the type of code that you are comfortable using.

And yes, I think Ruby/Python produces better code, but in the end, any code can be made to look horrible and run slowly.

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twitter actually uses scala now

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Actually Twitter currently use many programming language(C++, Java, Scala, Ruby on Rails)on server side similarly like other web application like facebook use Hack, PHP, C++, Java, Python, Erlang, D Xhp.

Here is detail and updated Link