In the graph above I’ve arranged the 28 Threadiverse instances with at least 200 monthly active users (MAU)—orange instances running Lemmy, green Piefed, and red Mbin—on the basis of which instances they defederate.
Each instance has its MAU count listed below it, sourced from the latest MAU figures at Fediverse Observer, with adjustments made to the totals for Piefed (due to undercounting by outdated instances, as noted here; I used @Vicinus@piefed.zip’s suggested estimate of 7,200 Piefed users) and Mbin (due to tardigram.com having a duplicate listing).
After adjustments, there are an estimated 43,287 monthly active Threadiverse users (35,184+7,200+903), of whom 87.84% are on the 28 largest instances. The percentages listed alongside the MAU figures correspond to each instance’s share of the total MAU count.
Defederation data was sourced from Federation Checker. The tool doesn’t support Mbin instances, so I left fedia.io in its own category. If any defederations are missing, feel free to let me know. Ideally such a chart should also include community blocks to better illustrate which instances block what, but that data doesn’t appear to be as easily searchable.
I also noticed cases of some instances being listed as being defederated by another instance, despite not appearing on the defederation list for that instance (i.e. reddthat.com and lemmygrad.ml are listed as being mutually blocked, despite neither having the other on their block lists). In testing that federation, I noticed that !wholesome@reddthat.com did not federate to Lemmygrad while !memes@reddthat.com did, so clarification on that matter would be helpful.
While I’ll update my generalized chart as needed to correct errors, perhaps at some point an automated federation mapping tool similar to the one feddit.de formerly hosted could be developed to more completely illustrate instance federation.


Lemmygrad.ml is a Marxist-Leninist instance. The users are very chill there normally, so the reason for defederation is ideological.
Ha! Haha! Hahahahaha! Good one!
Have you visited Lemmygrad.ml? Just click on some of the threads, there’s much less hostility than most Lemmy.world threads. The idea that the commies on Grad are bloodthirsty beasts or something is more a consequence of their wide defederation causing defederated instances to project their imagination, not an actual analysis of how they act.
I’m sure they’re all patting each other’s backs there. But I’ve interacted with them elsewhere and when they are exposed to anything but straight tankie bootlicking they turn vicious. Not a single decent interaction, and I’ve had several.
I don’t think it’s unreasonable to say that communists will generally oppose anticommunist viewpoints, and certainly critique non-communist views. Communists also tend to be political activists, so we also care quite a lot, which can often spill out into heated exchanges. This isn’t unique to communists, though, liberals are the same way for views they don’t align with. Therefore, the biggest difference and the reason for defederation is ideological, after all, irreconcilable political differences.
Ideological differences don’t explain the brigading, dogpiling, constant trolling, bad faith arguments. There are only so many times an instance admin is willing to ban single users from a place until they get fed up with a culture of abuse and cut ties with the whole lot.
I haven’t seen Lemmygrad brigading, trolling, or arguing in bad-faith. Active users going into active threads organically isn’t the same as brigading, which is typically associated with coordinated targeting. This can seem like “dogpiling” in practice, but again, this same behavior is exhibited by non-communists, same with what can be perceived as trolling or bad-faith arguments (and anecdotally I see far more of that on instances that aren’t predominantly leftist).
In the end, it’s ideology, not specific traits, as ideological differences cause not just communists but non-communists to behave in similar confrontational manners. Lemmygrad.ml aren’t especially bad-faith, trolling, etc, just like Lemmy.world isn’t. Both have distinct ideological identities and this difference caused friction.
You keep going back to an unexisting ideological divide. I’m a communist. Most of Lemmy everywhere is socialist. That was never the issue.
“Non communists are toxic too” is not a defense. It’s an admission. Of course you’ll find toxic examples in any sufficient large group of people. It’s when the group culture fosters that behavior (or at least fails to curb it) that it becomes a problem.
You’re fighting hard to deny this, but think earnestly about why so many staunchly left wingers couldn’t stand them anymore. It’s not because they want “from each according to their means, to each according to their needs”. The (stated) ideology is exactly the point of agreement.
My point is that there is no group culture fostering that behavior on Lemmygrad.ml. There’s no evidence of any of this outside the norm for any other instance.