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Theres a high scalability post from years ago that has a bit more information. http://highscalability.com/blog/2014/3/31/how-whatsapp-grew-...


Thanks, it does seem like choosing a language that was made for doing things in parallel to begin with was a good idea. To be honest, I've always felt that programming in functional languages creates less bugs, but perhaps that's just my imagination.


It certainly creates fewer bugs of a specific nature, depending on the language.


>19B messages in & 40B out per day

whatsapp being a closed system I don't understand how this disparity is possible.


Most people are in group chats.


this is great. wondering if Telegram also have a post similar to this? (unlike whatsapp, they do store the messages)




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