[DUPLICATE] What programming languages are used for facebook?

Question

What are the applications of these languages on other social networking sites?

Answer 1

https://www.sololearn.com/discuss/510988/?ref=app
https://www.sololearn.com/discuss/496552/?ref=app
https://www.sololearn.com/discuss/232606/?ref=app

Answer 2

https://www.sololearn.com/discuss/947465/?ref=app
https://www.sololearn.com/discuss/953091/?ref=app
https://www.sololearn.com/discuss/893697/?ref=app
https://www.sololearn.com/discuss/828671/?ref=app
https://www.sololearn.com/discuss/684221/?ref=app

Answer 3

Java forever ;)

Answer 4

advance php..