Perhaps you're thinking of Facebook chat? https://www.quora.com/Why-was-Erlang-chosen-for-use-in-Facebook-chat https://www.quora.com/Why-was-Erlang-chosen-for-

Perhaps you're thinking of Facebook chat? https://www.quora.com/Why-was-Erlang-chosen-for-use-in-Facebook-chat https://www.quora.com/Why-was-Erlang-chosen-for-use-in-Faceb... 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 https://www.quora.com/When-did-Facebook-switch-away-from-usi...