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News.yc is written in arc, which to my best knowledge is a functional lisp like language.

Reddit is written in Python using web.py as the framework. It was originally written in lisp but they changed to Python for various reasons.

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Just to be a bit more technical...

Arc uses MzScheme.

Reddit was using Common Lisp but now uses Python/web.py as you said. I remember hearing that they may switch to Django.

Actually, they tried Django but it did not meet their needs so they switched to web.py.

I think it's because they like the anti-framework way of doing things (eg. calling a bunch of libraries instead of letting the framework generate code in your app directory). Both TBNL in Lisp and Web.py in Python seem to do a great job in keep your footprint small.

I thought Reddit was rewritten in Rails, but after some research I realized that I am wrong. Its Python.

If you were at startup school you might of heard Chris Anderson, editor-in-chief of Wired (so presumably their new boss), erroneously suggest that Reddit is written in rails.

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