[ramy_d]

I think WhatsApp is still using Erlang and they are biggest messaging app in the world. Discord is using Elixir but it's more niche. I think if you look at use cases where they excel, you will find them there.

[greenavocado]

Discord uses Rust (and Elixir) https://discord.com/blog/how-discord-stores-trillions-of-mes...

[Zambyte]

https://discord.com/blog/using-rust-to-scale-elixir-for-11-m...

[conradfr]

They use both.