I wish the fediverse would just stick to one set of jargon, and everybody uses the same terms to mean the same thing. Even "instances" should just be called "servers". That's all it is. This server talks to that servers, and information is exchanged.
So, if I understand this right, "magazines" on Mbin are the same as "communities" on Lemmy, are the same as subreddits on reddit. Three names to mean the same thing.
And a "Thread" is just a post. Like I'm making a post right now on Lemmy. If I did this on Mbin it would be called a "Thread".
But then I see there's also "comments" which is self explanitory (I hope...)
And there's also "Posts". But if Threads are posts, then what are Posts?
QUIT FUCKING AROUND WITH TERMS, FEDIVERSE! LETS ALL JUST KEEP THINGS SIMPLE!!!
........I keep thinking I have things figured out, until someone says "yeah, but have you tried this?" and then I look into it, and I'm confused again. Arg!
Mbin has a specific and different meaning for the term "post" as used in the OP, so it's one place where translating from lemmy or other "generic internet forum" jargon doesn't work. It's for microblog posts associated with a magazine that are independent of threads in that magazine.
E.g.: https://fedia.io/m/firefox/microblog has "posts" in Mbin terminology -- though if I had to guess I think most Mbin users will use the qualified "microblog post" or similar if they actually mean to reference the Mbin meaning of the term.