"with one exception"

I might represent that. They ran a great Contest with Whatsapp. It seemed to work like a very quick E-mail reflector. Jamie provided great user support which mitigated the effort of installing the extra app for a few of us old fossils. It saved the effort of having to setup a reflector for the contest.

My objection was that it seemed an extra app and potentially gave up the phone's contact list and i-cloud account access to Facebook. With a bit of effort it can be made to work without the contact list and i-cloud access, which made it fine.

If I was interested in international messaging, I might consider it as a goto app. That seems it primary market niche these days.