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They are definitely the outlier and the version of php that fb uses can barely be called php when they more or less rewrote how it works under the hood.

But this isn't a dig at php, just stating chosen languages/frameworks matter a lot. I think it speaks volumes about a company's tech philosophy if they still mainly use php and jquery for web development.

What about if they use Java or C++ or Erlang for production code, rather than, say, Go or Rust?

The state of thr deployment pipeline and tests matters a whole lot more than the specific language.

To be fair back in the early 2000’s PHP was one of the best options.

And for many purposes, still is.

To your point they also, like, wrote their own PHP interpreter. If you asked your Facebook interviewer about PHP you'd probably get an interesting answer!

compiler

twice