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This comment focuses on the back-end. As important as it is, as far as I remember when FB acquired WhatsApp then one of the main advantages was the presence of
by radmuzom 11y ago
This comment focuses on the back-end. As important as it is, as far as I remember when FB acquired WhatsApp then one of the main advantages was the presence of clients in almost any mobile device (thanks to J2ME). I am pretty sure it is not trivial to maintain so many clients, even though over time the older clients will disappear and it will be mostly Android / IPhone / Windows (??) that the engineers need to maintain.