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According to them[0], Facebook's primary languages are C++, Java, and Python, and they're even embracing Rust now. In general, teams have the freedom to choose what languages and technologies they want to use. (quoting from the linked video)

They might've started with PHP, but even that stopped being a thing once they switched to Hack, their home-grown language, ~10 years ago.

[0]: https://engineering.fb.com/2021/04/29/developer-tools/rust/

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Not quite. According to a more recent article, Facebook's PHP, Hack, is still a primary language:

> For business logic and relatively stateless applications, the Hack ecosystem has the highest level of automation and support at Meta and is the recommended language.

On a related note, their Rust usage has grown significantly:

> For performance-sensitive back-end services, we encourage C++ and Rust. Rust is a new addition to this list. There’s a rapidly increasing Rust footprint in our products and services, and we’re committing to Rust long-term and welcome early adopters. For CLI tools, we recommend Rust. This is a new recommendation for this year.

https://engineering.fb.com/2022/07/27/developer-tools/progra...

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