Чувак из фейсбука рассказал, почему они отказались от эрланга в мессенджере. В общем ответ "были баги" www.quora.com/When-did-Facebook-switch-away-from-using-Erlang-for-Facebook-Chat?share=1

When did Facebook switch away from using Erlang for Facebook Chat? - Quora

(To set context here, I worked at Facebook at the time this transition was made. While I was not a member of the Chat team, I did spend some time studying th...