It was one of them. However, given the other writing/talks Facebook has put out about their usage of Haskell and Haxl, Go is probably not a good fit for their u

It was one of them. However, given the other writing/talks Facebook has put out about their usage of Haskell and Haxl, Go is probably not a good fit for their use case due to language expressivity concerns (not declarative enough, not enough type safety, not syntactically flexible enough for writing DSLs).