What programming language does facebook use? [closed]

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I don't know much about programming languages, but am interested in a career with facebook, so I was wondering if someone could tell me what programming language facebook uses.

Also, do any other social networking sites use the same language?

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Facebook uses the LAMP stack, so if you want to get a career with them you're going to want to focus on that. In addition they often have C++ and/or Java listed in their requirements as well.

One of the postings includes the following requirements:

• Expertise with C++ and/or Java
• Knowledge of Perl or PHP or Python
• Knowledge of relational databases and SQL, preferably MySQL and Oracle

Another:

• Expertise in PHP, JavaScript, and CSS.

Another:

• Knowledge of Perl or PHP or Python
• Knowledge of relational databases and
• SQL, preferably MySQL Knowledge of
• web technologies: XHTML, JavaScript Experience with C, C++ a plus

Source

http://www.facebook.com/careers/#!/careers/department.php?dept=engineering

Also, do any other social networking sites use the same language?

Some other companys that use PHP/LAMP Stack:

• DeviantArt (more focused on art)
• Twitter (for Front-End development)
• Google+

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Since nobody has mentioned it, I'd like to add that Facebook chat is written in Erlang.

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The language used by Facebook is PHP.

Also, do any other social networking sites use the same language?

The other one I know of is friendster.

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might be surprised to know.. its PHP. read all about it here