Whay the most powerful website/company like Google and Facebook develop their own language during programming of their things!?

Question

thought is tough even though it's made good habit

Answer 1

You mean why did google start Go? and Facebook hiphop_php? most of the time it's because current language don't have the features, capabilities or speed of current languages. reading the Wikipedia pages of Go and Hiphop_php will give you more information. for instance hiphop_php converts pho to c++ as Facebook uses c++ in their backend software

Answer 2

Hack