На каком языке программирования написан Facebook???

Answer 1

Assuming Google translated your question properly,
https://www.sololearn.com/Discuss/973710/?ref=app
https://www.sololearn.com/Discuss/1171873/?ref=app
https://www.sololearn.com/Discuss/1169128/?ref=app
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 2

C++ и PHP

Answer 3

На английском.