Is a widely-used, free, and efficient alternative to competitors such as Microsoft's ASP. Which course is that?

Question

It is powerful enough to be at the core of the biggest blogging system on the web (WordPress)!
It is deep enough to run the largest social network (Facebook)!
It is also easy enough to be a beginner's first server side language!

Answer 1

Somehow I have the impression that you already know the answer to the question, in fact, the details you wrote in Description tends to point to a specific language. So, in curiosity, why you ask this, knowing the answer at hand? I truly hope you were not conducting a survey or polling here in Q&A Discussion, feeds post is the place for that : )