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WhatsApp was built using Erlang I believe. WhatsApp is now owned by Facebook. Are you saying they changed the tech stack for WhatsApp?

• yetihehe 8y ago
  Facebook chat did use erlang (Ejabberd to be precise), but they migrated to something other. WhatsApp uses erlang and is even a member (logo in partners section). So, Facebook uses erlang, but not directly as Facebook, but they changed tech stack away from erlang.
  • gdsdfe 8y ago
    Facebook Messenger is built with ReasonML
    • rkangel 8y ago
      The frontend is built with ReasonML on the web, and some other stuff on mobile. What the backend is built with is separate.