JavaScript: Used for all client-side interactions and powered by the React framework. HHVM is a just-in-time (JIT) compiler that converts Hack and PHP code into highly optimized machine code at runtime.
Inside Facebook Development Workflow Tools and Technologies
Understanding what language Facebook is written in provides insight into how the platform handles billions of interactions every day. CSS/HTML: The standard languages for structuring and styling web pages.
Behind the scenes, this experience is powered by a complex stack of technologies, and at the heart of the backend logic lies a specific programming language. By creating Hack and HHVM, they solved the limitations of vanilla PHP without abandoning the speed of development that initially made the language so attractive.
Inside Facebook Development Workflow Tools: Streamlining the Hack, HHVM, and JavaScript Stack
Hack is a programming language created specifically for Facebook's needs; it runs on the HipHop Virtual Machine (HHVM). This pragmatic approach to technology—using the right tool for the job—has allowed the platform to scale to extraordinary sizes while maintaining a responsive codebase.
More About What language is facebook written in
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