Which programming language is used to allow communication in web? Like on Facebook chat.

Question

Web development

Answer 1

In Facebook they should use, among many other technologies, the programming language Hack (much similar to PHP) but more in general any back-end language can do the job.

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https://www.sololearn.com/learning/1059/1801/3500/1

Answer 2

Communication on the web is generally enabled by the HTTP protocol. This is not tied to any specific programming language. You can write web applications in any language.

https://en.m.wikipedia.org/wiki/Hypertext_Transfer_Protocol

Facebook may be an interesting case study, but what they do on large scale, serving millions of requests every second, is completely different than a basic level project. So the fact that they are using PHP, Java, C++, Erlang, Haskell and even Python in their backend system, is not a practical pattern to follow for an average developer.