50 billion messages per day with 32 engineers - SERP Analysis

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https://news.ycombinator.com/item?id=37281000

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https://www.youtube.com/watch?v=fVBC6n66PME

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https://www.phonearena.com/news/WhatsApp-handles-more-than-50-billion-messages-daily-figure-might-exceed-daily-SMS-volume_id51605

https://en.wikipedia.org/wiki/WhatsApp

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