Agreed. I think this title is a bit flippant and I'm sure the 600M+ WhatsApp users don't care what the servers are running.
The important takeway is that FreeBSD and Erlang have worked really well for WhatsApp allowing them to grow their userbase insanely fast while still staying relatively small.
The important takeway is that FreeBSD and Erlang have worked really well for WhatsApp allowing them to grow their userbase insanely fast while still staying relatively small.