I've been on Tumblr since 2012, and I've been getting noticeably more traffic on fandom-tagged posts over there recently. I get the feeling it's in a weird in-between state where it's not as active as it used to be, but people are coming back so there's more people interacting with posts, haha.
I went back to Tumblr because it's the only one I think I can probably trust not to do a bait and switch with their ToS to use artists' work to train AI (and if they do, I trust that they would also fumble actually committing the IP infringement). I've been told you get a lot more engagement relative to how much engagement you do - so like, if you go out and comment on people's stuff, other people come and comment and interact with you vs. some algorithm occasionally deciding to show your post to tons of people. I haven't really tried it, but I can see how it could be true, because people are really chatty. Any time I draw fanart, I get tons of engagement for months after (compared to other social media where your window is a couple days) so that's nice.
I assume it is: I periodically go back and never really see anything except for a few kinda stale blogs... Maybe I'm just not on enough, but it seems like a place just for fan theories and/or random pictures of household objects
I use Tumblr to post my Art sometimes and read fanfiction so there’s that. I find pretty neat stuff on there besides the spam p**n accounts. They’re annoying.
Tumblrina here.
Tumblr is pretty active even to this day, most of people there tho belong to fandoms so most of the content there thrives if it's targeted to either a very invested franchise (Superwholock aka Supernatural, Doctor Who, Sherlock or anything similar to that) or a currently airing series and whose fandom will die once it finishes.
Original art doesn't do very well if you're not constantly pumping artwork, making memes, having the pages accessible within the site or a very organized blog where you can get the lore quickly, many people that thrive with their original content usually used the strategy or making fancharacters and eventually separating them from the original franchise it was inspired on.
I personally like it quite a lot, I feel is a bit more organized and easy to customize, most of the art stuff and resources that I drop in the Tapas Art Master Library1 is found from there
this reminds me, we have to follow the hastag of "supernatural" or "destiel" because that's how we break international news in this website.
I tried going back to Tumblr a couple times through November/December of last year but kind of just gave up around January...my account is still there but I'm pretty sure there are more bots than actual people there...
Tumblr had a massive exodus towards twitter, but when people discovered twitter was just as shit, tumblr had a resurgence. I doubt it's as big as it used to be, but it's still kicking.
I've been on Tumblr since 2010 and I take a break now and then, but I like coming back to it, and my dashboard is still very much alive. I follow a bit over 600 blogs (but don't know how many of them are active). I even used to make Transformers gif sets. 
I'm also into interactive fiction and lots of IF authors post on Tumblr. But I don't know about art, as I'm afraid I don't pay that much attention to it.
okay so here's the thing, some people of tumblr doesn't want twitter refugees, at least not the bad ones, we can all agree that tumblr is that room with the wall written and painted in different ways, with one functional light in the corner. is an habitable room, but not your first choice. and many people like to keep it that way.
keep our bullshit on which we can say things like, "I hope your brain is eaten by worms" (affectionaly). without someone worrying that they might get cancel for it. also, I've been threaten by this (↑) before, it is not an exageration.
Boy (gn) you could have attached all that in a single post and they would have still got the message
You know what? I'm sending you to Super Hell for spamming and commiting gay crimes 
My experience with Bluesky so far is it's pretty quiet. Probably due to how new it is, and that you need an invite code to even get in, but there just aren't a lot of people consistently posting there.
Also for some reason it clears my feed periodically so I can't see old posts anymore? I find that very annoying??
Bluesky for comics, from what I've seen over the past month;
The furries colonized it first and their art, mostly lewds, dominates.
Webcomics looks like the same very small crowd you always see promoting here and on Pillowfort/CoHost/Mastodon. Same goes for the artists who label their stuff as "manga" but that topic is mostly for fans discussing their favorite shows. Comics itself is a bunch of old direct market guys talking about the latest stupid shit Marvel has pulled.
I'd say it's wide open as a platform, but right now most of BSky's user base seem to be there solely because they, justifiably, hate Elon Musk. You can tell that they'll return to Xitter the second he's gone.
I have 4 invite codes at the moment. I think I have my DMs open to everyone so first come first serve? The only way to take over is to outnumber.
Neil Gaiman is active on there. What else do you need?
