[wolco]

What happens when you need to scale up or if one or more of the gurus quits? Do you think Haskell will still be primarily used when you grow?

[mbrodersen]

Ask Facebook. They are running Haskell at massive scale.

[g_delgado14]

For what business units? For which use cases?

Also, they invest a lot into recruiting. My suspicion is that they give a considerable degree of freedom (often to the detriment of the organization in ways such as information silos) to engineering teams to help with recruiting.