Sure! I like reviewing the media I consume, so that's what my BookWyrm and NeoDB accounts are for. Also tracking stuff I haven't gotten to yet, etc. BookWyrm for books, NeoDB for literally everything else lol. I know I could just do that with a notes app or something, but I enjoy getting comments on my reviews/lists/etc and commenting on others. And finding new stuff I wouldn't have heard of fron other people.

WAFRN is my main shortform platform, mostly I use it for shitposting and shouting into the void, but It's also where I follow the accounts of all the people and projects I like to keep updated on. So I can fangirl at the creative team behind this or that audiodrama whenever a new episode comes out, for example. If I wanna shout into the void except even longer, I write long blog posts on WriteFreely instead. Those will usually be some craft or food project.

People here will already totally get PieFed I'm sure. I generally use it for forums dedicated to super niche topics, like Shavian English or breadmaking or w/e.

On Loops, I'm mostly posting short video memes. Someday I'd like to post educational/informational stuff too, but that's a lot of work...

I use PixelFed for literally everrrryyyyy type of posting that involves pictures. Memes, my garden, dishes I've made, stuff patrins make in my makerspace, etc. There's no rhyme or rhythm there. I've just naively assumed that, being specifically for pictures, it must be optimized to host them better than the other platforms? I'll even post to Lemmy communities from there instead, if pictures are involved.

Well I'm not sure if I can really recommend the one I'm on. It's randomly gone down for lengthy periods more than once, the admins seem difficult to track down, and it's frequently out of date. Probably I should have migrated away, but I'm attached now 😝

If I were just starting out, I'd probably join this one:
https://anar.chi.st/

EDIT: oop I misread that as "instances" lol, sorry! I definitely follow lots of cool accounts, like @amazonrestore@gram.social

It's very nearly a Discord clone, which makes sense gicen the creator had contributed code to Discord in the past. The main instance is overpopulated though, it runs terribly compared to the self-hosted ones. That said, I'd go Matrix over Fluxer if my friends would let me. It's not federated or even E2EE.