How Whatsapp is / was deployed?

I wonder how Whatsapp was/is deployed? Is it deployed on some cloud hosting or a network of physical (dedicated) servers? How its deployment changed once it was sold to Facebook?

Thank you all!

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Physical servers, with some special OS tuning. And FB runs all their own servers, much of their infrastructure is custom-built…

This talk from Maxim Fedorov from Whatsapp is really good: https://www.youtube.com/watch?v=FJQyv26tFZ8

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