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Re:Why WhatsApp Only Needs 50 Engineers for Its 900M Users by morley on Wednesday September 16, 2015 @10:19AM (#10226764)
I'd say one talk at an erlang conference three years ago falls into the umbrella of not talking much. The article doesn't say "they never talk about engineering."
Re:Why WhatsApp Only Needs 50 Engineers for Its 900M Users by rdtsc on Wednesday September 16, 2015 @10:36AM (#10226899)
It is an hour talk and it specifically mentions how Erlang was used and how it gave them a strategic advantage.

I have found other mentions about it, perhaps on Erlang mail lists, here is an interview with Eugene Fooksman:

https://pdincau.wordpress.com/2013/03/27/an-interview-with-e...

"""

And the consensus in our team is that it is largely because of Erlang. We’re managing to serve huge amount of connections from single front-end server (this is from last year’s Erlang

"""

I don't know how much clearer can it get.

Here is another directly from their website:

https://blog.whatsapp.com/196/1-million-is-so-2011

It is a bit older they clearly indicate that FreeBSD and Erlang are key and critical elements that let them operate they way they do.