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What's more fascinating is that erlang underpins many more staples of the internet than most geeks even know. WhatsApp is just one 19B example.

Yep. Especially when you consider that things like RabbitMQ, Riak, ejabberd, etc. are written in Erlang and take advantage of OTP.

Not only the Internet.

A few German game studios are using it on their backends.

Physics in Erlang? Game scripting engine implemented in Erlang? What types of games are we talking about here?

I wrote backend. Physics and game scripting belong on the client side, usually.