*>How many applications on the web are written in a lisp?* You are using one rig...

>How many applications on the web are written in a lisp?

You are using one right now: Hacker News is written on a Lisp: Arc.

Also, the first HTTP 1.1 compliant server and used by the W3C to debug the HTTP 1.1 reference implementation, was written in Common Lisp.