Hi, I have a client "Clim-Cash.fr", that sell Air Conditionning. They work with a large group of installator. They want to keep in touch with them regularly to keep them informed about new offers, new technical info, new products etc. Actually they using Whatsapp. What best advice could I give them and offer them to keep those people regularly informed… What tool could help. Is Facebook group a better option ? What else can help ? Thanks for your ideas.