I can list some alternatives to Discord that you probably don’t know, and requirements for an alternative to Discord: https://degooglisons-internet.org/ https://framasoft.org/en/manifest https://www.privacyguides.org/en/real-time-communication/ https://www.privacyguides.org/en/real-time-communication/#criteria
Also consider https://soatok.blog/2024/08/04/against-xmppomemo/ https://soatok.blog/2024/07/31/what-does-it-mean-to-be-a-signal-competitor/ !privacy@lemmy.ml
I’ve used reddit.com before but I never made many posts or comments and I haven’t used it in years. I’m pretty sure there was a period where I visited it regularly though.
I don’t think I’ve ever posted anything with facebook.com or twitter.com either. I never browsed them for fun, and if I want to coordinate with someone in my family I just contact them directly. I do use youtube.com a lot though.
I tried using pleroma but I haven’t used that in a while either. I prefer lemmy much more (probably because posts being different from comments provides more structure).