Haskell is often seen as an powerful and interesting language — but one which isn’t really designed for the masses, and certainly not for large-scale business applications. And yet, it turns out that Facebook, one of the largest Web sites in the world, has been using Haskell for certain tasks. This means that they not only had to train developers to use Haskell, but also to scale Haskell programs up in ways that had never been done before. In this talk, Jon Coens describes what he and his team and Facebook did in order to accomplish this task, giving us insights into the Haskell language, team organization, and the ways in which such technologies might gain acceptance in the broader business world.