PHP and ASP are best if you are new. Some servers also allow C.

my name is jay padaliya.and I already know c and c++ basic lavel.and expertised in html,css and javascript.My goal is to make high traffic and powerful web application like facebook,twitter.for that i have to learn server-side programing lang.but i confused that which is best pro-language for me and for my goal?

please suggest me.