That multiple chats drives me bonkers. I have all of the above plus Signal and not FB Messenger but my friend and I decide on one app to communicate and that’s it. iMessage if they’re iPhone users.It’s like that all over here. Someone mentions Toyota and then others say Chevy. Welcome to the internet.
I use both because it makes it easier for people get a hold of me. I’ll have a message on iMessage, WhatsApp, Telegram, and Facebook Messenger all with the same person and 4 different conservations.