However when I started working on Feedbase (2015) I wasn't really good enough at Haskell to accomplish the task before I giving up in frustration, so I fell back to my usual preferred scripting language, Perl, for the part that fetches the feeds and updates the database and for the nntp server - I only implemented the (quite simple) website in Haskell.
I've gotten a little better since then, so my little blog-engine, Lantern, which also uses nntp as the main "interface", is written completely in (beginner) Haskell.