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what language does google and others use

What language/framwork does google and others like msn, yahoo, orkut, facebook, twiiter etc use. Or for the matter of fact any popular website.

I know the following

  1. Facebook - PHP
  2. Yahoo - PHP
  3. Gmail - Java
  4. Twitter - ROR and Scala
  5. Foursquare - Scala

What about others

EDIT:

Google employees are officially allowed to use 4 languages Python, Java, C++, JavaScript. this does not mean they cant use other languages.

Solution

  • Google Search - Python (http://python.about.com/b/2006/11/17/creative-search-technology-with-python.htm)

    Google Wave Protocol - Java (http://code.google.com/p/wave-protocol/ (You can check it out and study it, just 40000 rows ;) ))

    Google Wave Front-End - Google Web Toolkit (http://code.google.com/webtoolkit/doc/1.6/examples/)

    Google Moderator Front-End - Google Web Toolkit (http://code.google.com/webtoolkit/doc/1.6/examples/)

    Google Maps Front-End - JavaScript (Which language is used in google maps frontend?)

    Gmail Frontend - JavaScript (http://en.wikipedia.org/wiki/Gmail#Code_changes)