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Re:Ejabberd Massive Scalability: 1 Node – 2+ Million Concurr... by tiffanyh on Wednesday January 20, 2016 @09:51PM (#10943041)
Whatsapp uses a modified version of ejabber. Ejabber is written in erlang.

http://highscalability.com/blog/2014/2/26/the-whatsapp-archi...

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