I've used and converted a lot folks to Signal over the years. The surge in recent growth is still shocking. https://www.nytimes.com/2021/01/13/technology/telegram-signal-apps-big-tech.html
Ribeiro.Social is a private invite only instance, living the dream of sustainable social networking with a 1990's webring mentality.
For additional context, read Justin's "Ghosting the Socials and Expanding My Open Web Existence".