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New code at Facebook does use both. Instagram uses both extensively.



Does Facebook use Python 3 for Facebook frontend website? Or in PHP/Hack? (Facebook website frontend is well known to be in PHP/Hack)


Facebook's WWW is Hack. Instagram's WWW is Django on Python 3.6.


https://en.wikipedia.org/wiki/Hack_(programming_language)

> Hack allows programmers to use both dynamic typing and static typing. This kind of a type system is called gradual typing...

I wasn't aware of such a type system, and there're many languages which use both:

https://en.wikipedia.org/wiki/Gradual_typing



You have links to public repos, or you're speaking from work experience?


I work at FB.




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