what language does google and others use [closed]

Question

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.

Answer 1

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)