As another dinosaur I use email and SMSs. If I need to talk to someone I generally use a normal phone call, our contract gives unlimited calls for both landline and mobile in Italy. For calls to other countriesI often use Skype Out which allows you to call at very low cost. I do not use Skype for any other purpose. I also have an account with Viber which I use to keep in touch with the only girlfriend from my long lost youth that I still have contact with. For some reason that I fail to understand she only uses Viber to keep in touch with me so I don't understand why I can't talk her into switching to the only messaging app that I use: Telegram.
I have always seen the potential advantages (finding lost friends for example) of Facebook but I also well understood what is not to like about it so I have never opened an account. I was an early user af WhatsApp, and even paid their miniscule annual fee, but when Facebook paid $18 billion to acquire it I dropped it like a hot potato.
I won't go into detail as to why I use Telegram but, suffice to say that in my opinion it is the best messaging, voice, and video calling app available. I use voice and video only for family. Unfortunately for me many of my contacts are stuck in WhatsApp but I am one of those weird people that refuse to compromise and I simply refuse to have anything to do with the Meta group of companies.