As mentioned on https://github.com/erkmos/haskell-companies https://github.com/erkmos/haskell-companies, IMVU uses Haskell pretty extensively. Originally the se

As mentioned on https://github.com/erkmos/haskell-companies https://github.com/erkmos/haskell-companies, IMVU uses Haskell pretty extensively. Originally the server-side portion of the product was almost entirely PHP3 (with some bits of perl on the backend for things like Memcached) and then over time large portions were rewritten in Haskell (one service is/was Erlang, I think.) Part of the motivation for this was the incredible pain of the forced transition to newer PHP due to all the compatibility breaks.