erlang-stack

http://blog.contus.com/how-whatsapp-works-technically-and-how-to-build-an-app-similar-to-it/
http://erlang.org/doc/reference_manual/data_types.html
http://www.erlang-factory.com/conference/SFBay2012/speakers/RickReed
https://www.vocal.com/cryptography/rc4-encryption-algoritm/
http://www.contus.com/messaging-solutions.php
http://erlang.org/doc/man/mnesia.html
https://www.ejabberd.im/
http://www.erlang-factory.com/upload/presentations/558/efsf2012-whatsapp-scaling.pdf
http://stackoverflow.com/questions/2904669/how-easy-is-it-to-get-a-custom-xmpp-server-app-running
http://www.erlang-factory.com/upload/presentations/708/HitchhikersTouroftheBEAM.pdf
https://www.lighttpd.net/
http://highscalability.com/blog/2014/2/26/the-whatsapp-architecture-facebook-bought-for-19-billion.html
http://www.erlang-factory.com/upload/presentations/558/efsf2012-whatsapp-scaling.pdf
https://github.com/klacke/yaws