You sign up on (or create) an instance that defederates from them.

I've found that similar communities on different instances can have VERY different experiences in terms of the community and attitude. I know I'm generalizing, but I feel a lot of Lemmy.world instances are more negative and hostile than similar instances on beehaw.org. Personally, I'd rather they stay separate. That way I can be more precise on dialing in the experience I want.

Got it. Thanks!

Do you have any more details on this (or know where I can find more). I'm currently trying to decide which Lemmy app to use, and would be interested in reading more about Mlem's history.

Would you be able to give a brief overview of what your tool does? I feel like it's perfect for my situation, but am new enough to all this that I'm not exactly sure what the tool does.