Lemmy fulfills a sort of reddit/more intimate internet forum thing. Reddit's real social good was fixing shitty search engine results by using Reddit as a keyword, and for centralizing a lot of hobbyist discussion. Lemmy and the lemmylikes will get there as the platform matures.
I'm loving pixelfed as a sort of Imgur substitute tbh. Quick and easy image hosting for when I post on here. Not crazy about Instagram as a social media platform so there's nothing I need pixelfed to do besides let me host medium-sized images, caption them and copy the link.
I only used reddit as my big social media and then discord for messaging. Fediverse has become a good alternative to reddit, but discord will be hard to convince people to move over to alternatives like matrix or revolt.
I was only ever really into Reddit, which Lemmy has handily replaced.
I technically have an Instagram, but I scrubbed it and removed the app to stop me from doomscrolling and giving Meta ad revenue.
Microblogging like Twitter or Tumblr never really appealed to me.
I was born after 2000, so Facebook doesn't exist in my world.
I do use Discord, but mainly because all my friends and family are on there. I would love if a federated alternative like Matrix became the standard. Hopefully the EU's Digital Markets Act will help - if I understand it correctly, Discord and other platforms will be forced to allow seamless bridges (which currently will get you banned) under interoperability requirements.
I've been using Mastodon even if I was never a Twitter user. (Or at least, not a serious user. I had an account some time ago, as I was dating a girl who posted there often and she insisted that I should use it.)
I've been trying to convince people to migrate from Whatsapp to Signal. Easier said than done due to network effect.
Trying to replace reddit on PC but this place still isn't great for gaming and wrestling and niche games i'm currently into. I do enjoy it on my phone though, also tagged back in Somethingawful on my phone also for some nice reading of some classic threads and PYF stuff.
Other than that, no need to replace anything otherwise :)
I didn't really do Twitter but was big into Instagram for a while until the whole thing started with them pushing reels, so honestly Mastodon is more of a replacement for IG in my particular case. I can upload images, so there's no real need to keep a separate Pixelfed. Pixelfed users who just want to see images can in fact follow people on Mastodon, and just get their images. I can also follow people on Pixelfed and see them in my Mastodon feed. So that covers all the bases really.
Still use Discord plenty, never really had a problem with it although I do use it for its intended purpose rather than trying to turn it into a forum which is where a lot of servers seem to go wrong.
Don't use FB, although I understand Friendica is the main replacement software for that.
Been considering looking into PeerTube but it seems best for very short videos just due to file storage. Mine tend to be more around the 15-20 minute mark on average so not sure that would work.
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
I recently came across https://pixelfed.org/ for an Instagram replacement. I haven't had a chance to try it out yet, but it looks promising. Seems like a federated platform like Lemmy/Mastodon that's geared towards photo sharing.
Mastodon (specifically mstdn.ca). Lemmy.ca, pixelated (though I rarely use it like I should) and I'm hoping to soon get a tilvids account to document my progress modelling for X-plane and creating the assets for my own computer board game.
Really just use Lemmy, Mastodon, and Element. I keep Discord installed because all my irl friends use it. I don't interact with any servers on it anymore though, just DM friends.
Out of the open platforms, I use:
Reddit: Lemmy, Beehaw, Kbin
Twitter: Mastodon, Calckey
Facebook: idk nothing really plus I don't even use Facebook that much anymore
I may occasionally use proprietary ones like Twitter, Tumblr and Threads.
Reddit with Lemmy and WhatsApp with Signal. I still use Reddit and WhatsApp but i would miss out on to much if i cut the ties. I have LinkedIn but i'm not really using it. Does YouTube count as social media?