I think they're both responses to the same challenges: distributed web enabled applications. On the server front that means ever increasing complexity with dec

I think they're both responses to the same challenges: distributed web enabled applications. On the server front that means ever increasing complexity with decoupled microservices and latency issues that play nicely with the classic approaches to those domains (static typing, functional programming). On the data front sites like HN, Reddit, or Facebook need scability more than consistency, and have oodles of 'uninteresting' data that jives nicely with a schemaless document store.