If "we" is Facebook, then yes, in 2014 https://en.wikipedia.org/wiki/WhatsApp#Facebook_era_.282014....

My bad, my sarcasm was apparently lost in written form...

I'm kind of curious now, I can't read in anyway that sounds sarcastic. Can you explain?

I just mean Whatsapp feels like an entirely separate entity from Facebook (unlike Instagram which is quite integrated)

Disclaimer: I work at FB.

I'm sure they'll eventually integrate. And they'll give the infra project a cheesy name -- just like instagration -- Whatsagration.