Why facebook google like websites are not developed by wix and wordpress

Question

and why programming language is necessary for it?

Answer 1

Simply because they have skills. They don't need those CMS.

Answer 2

Wix, WordPress and other web tools for website creation present limitations on what the user can or cannot do. Those limitations wouldn't allow those huge web applications like Facebook and Google to be fully dynamic and to fulfill their demand for data storage and high availability, for example.

Answer 3

wix and WordPress have limitations

Answer 4

They know how to make a website and not like many "I-want-to-have-a-website-peoples".