Bartosz, Haskell was created 23 years ago, before Java. What is the reason it did not catch on yet? Will that change?

I'm not aware of any even mildly successful system that uses pure functional languages. Most of the implementations I know about is either C/C++/ObjC or JVM. Some Python (Youtube, Dropbox), one .NET (StackOverflow) and pretty much that's it. What do I miss?

[Edit] I'm looking for production code, not "in-house" or "internal tools". I did read trough http://www.haskell.org/haskellwiki/Haskell_in_industry