Which companies are using Erlang, and why?
WhatsApp used to use Erlang, not anymore. Facebook rewrote it completely in C++.<p><a href="https://www.quora.com/When-did-Facebook-switch-away-from-using-Erlang-for-Facebook-Chat-What-was-the-reason-for-it-What-did-they-replace-it-with" rel="nofollow">https://www.quora.com/When-did-Facebook-switch-away-from-usi...</a>