I installed signal, only three of my contacts use it. One is a journalist, one is an artist/designer who does a lot in the crypto space and the last is a fellow enterprise architect. The first two are also active WhatsApp users. I’m as concerned about Facebook as everyone else, but you can’t seem to get around the fact that it’s the modern yellow pages. It’s the only platform,l everyone has, and it’s just incredible…
In parts of Asia Wechat is mandatory; I know it's not a popular (in the west) opinion, but I find Wechat the most user friendly out of them all; it always works (even on incredibly bad and dropping connections) and it just has everything under one roof. But for obvious reasons it is also the worst offering. Cannot be avoided in China though.