Why require many programming languages to build facebook?

Question

Python, C++, Java, JavaScript, Erlang, D, Xhp, Haskell, Hack, PHP

Answer 1

https://www.sololearn.com/Discuss/395790/?ref=app

Answer 2

Try watching this,
That is a question for someone from facebook
https://youtu.be/xFFs9UgOAlE

Answer 3

every programming language provides different feature.
i can say that there is no language that can provide every feature.
and Facebook is a site which requires lots of features ( security , large data ......

Answer 4

for security making designs making it online etc.........

Answer 5

There are many reasons
1. It is due to the library support each language have.
2. Every person has his/her preferences.
3. Some languages have strong security features, eg: Encapsulation and data abstraction in Java.
4. There are some great frameworks made in some languages eg: Django by python, Laravel by Php, Angular by Typescript.