Mastodon has been a fun replacement for twitter, but I don’t really use it to keep in touch with real life friends, I use it to meet new internet friends and keep up on niche topics/hobbies. I have no interest in a Facebook replacement tho. The format of Facebook is lost on me at this point and anyone who I want to keep in touch with since leaving Facebook has my phone number. As for family, I see them for holidays and it’s more than enough for me.