I'm not sure that the Whatsapp group is a good idea. I answer a lot of questions, and I can do this much more effectively if I only have to go to one place to look for new ones. I will not be supporting the Whatsapp group, or any other new forum that fragments the community (unless there is some strong benefit to the new forum that out-weighs the obvious damage caused by fragmentation).
So, my question is ... what can you do on Whatsapp that you can't do here??