Facebook uses a variety of services, tools, and programming languages to make up its core infrastructure. At the front end, their servers run a LAMP (Linux, Apache, MySQL, and PHP). Facebook’s backend services are written in a variety of different programming languages including C++, Java, Python, and Erlang .
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Facebook uses PHP for its front-end, and they also spend a lot of time dispatching to back-end services. Again their framework is home-grown, but they have even gone so far as to build their own PHP engine and development tools. They’ve open-sourced some of their framework code as well.
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