> acquisition of an existing viable product. (Messenger,

Messenger is native at Facebook. It's born on Facebook.com as a floating non-permanent window that only works when the other person is online. Wikipedia seems to confirm this https://en.wikipedia.org/wiki/Messenger_(software)#History

I agree on the Portal, it's perfect to call my grandma. I dread the day it will stop working because the alternative is an iPad that is worse in nearly every way (as a tabletop VC device for grandma)