Lemmy obvs.

Then NewPipe/freetube for YouTube. In saying this, though, I do acces YT directly if I need to post a comment or something, very occasionally. Not sure if the replacement counts as social media since they are just scrappers, you don't really interact with others.

I use Signal for family. Couldn't get friends to jump over. Nobody cares. Everybody loves Whatsucks.

Casual discord user, been looking at options but haven't made up my mind yet. Probably not worth the hassle considering how little I use it