There are a lot of communities across the fediverse based off of r/196, where the only rule is that you have to post something before leaving. I ended up blocking most of those communities because of the spam.
/r/196 was a popular sub on Reddit, about 500k subscribers. A lot of them were dedicated users who were very active and had recognizable usernames.
196 was one of the first major subs to shut down and point everyone to the fediverse. It helps that 196 was very LGBTQ-friendly and Blahaj.zone is also very explicitly LGBTQ-friendly, so it was a good match.
196 creates a lot of content because their "rule" was anytime you visited the sub you had to leave an image, whether it was a repost or not. This also works very well for a nascent fediverse where not a lot of OC is being made yet.
Thus 196 was pretty much in the perfect position to become one of the biggest places on the fediverse.
I think they're still down? Not sure, can't check any more. They were my favorite subreddit, so I've been submitting a few posts to the community here also.
Across the fediverse if you stick an @ in front of the 196 it'll work. Lemmy has a thing where they do an ! instead, but that's specifically their thing.
The front page is still very broken here on Lemmy and kbin. If a community is very active, it will show you nearly every post from that community. Depending on what time of day I log on, all the posts will be in German.