What Language Is Facebook Written In?
They use JavaScript for the frontend, specifically React. Backend? Mostly PHP and some Hack.
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A lot of Facebook's codebase is in PHP, but they developed a custom version called Hack to improve performance.
Facebook's frontend is mainly written in JavaScript, using the React framework. The backend is primarily PHP, but they also use Hack (a language they created).
Facebook is powered by a mix of PHP and Hack, with some JavaScript for the client side.
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