Telegram for family, friends, work and actually for everything I can think of.
Discord for gaming with friends, not as a messenger but as voice comms mainly.
Whatsapp for very legacy stuff, haven't had a notification in a couple of years. Maybe it's time to uninstall, finally.
This episode made me watch all of Black Mirror, and let me tell you it didn't stand up to this one. Watch White Christmas episode and you're good. Maybe add San Junipero, this one is really good too and it's more optimistic.