We have a group of people that uses Google Hangouts. We chose Google Hangouts because most of the users are on Google and we don't want to use WhatsApp. We publish things like documents for all the members who are on it. I can use WhatsApp, but I prefer Google Hangouts because with Google Hangouts we can directly share our screen. If you have two or three on Google Hangouts directly, someone can share their screen, and you can see what he's doing.