I have a Facebook account as the organisers of the park run I do only make announcements through their Facebook page. I don’t use it for anything else. Other than that I use WhatsApp as pretty much everyone in my country uses it to communicate exclusively rather than SMS or regular phone calls due to a very savy scam by service providers. Most of them stopped WhatsApp counting towards data usage on their contracts for a few years and heavily advertised that fact. Then they stopped doing that. People had got used to using the WhatsApp features like group chats and video calls and most of them assume it still doesn’t affect their data usage which means people are burning through their mobile data faster due to always having it turned on just so they can receive messages.