https://engineering.fb.com/2022/07/27/developer-tools/programming-languages-endorsed-for-server-side-use-at-meta/
Programming languages endorsed for server-side use at Meta

tldr：Meta’s primary supported server-side languages are Hack, C++, Rust, and Python.

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.  
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.
Finally, Meta continues to heavily support our Python developers. For data science, ML applications, and Instagram, Python continues to be the language of choice, and we continue to invest in the experience with this ecosystem.  
For specific use cases, we support other languages, including Java, Erlang, Haskell, and Go. These languages are currently not widely supported outside of specific use cases.
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修改:eGust FROM 203.184.25.*
FROM 203.184.25.*