I see from the responses that one thing that is omitted is the clearly higher audio/video quality. I had someone call me on facebook messenger, but had to ask them to call me on facetime purely because of quality, and its not the first time.
As with all Apple products "it just works". I wonder if that may change when it goes to the web.
As with all Apple products "it just works". I wonder if that may change when it goes to the web.