It’s posts from all the communities lemmy.mlknows about, as opposed to all of the communities everywhere in existence. Given enough people and time the two lists end up being basically the same but obviously during a period of rapid growth like right now, new communities are popping up every second so it’s gonna take a little while until all the major instances know about them.
Tools like lemmyverse.net let you keyword search communities based on your interests so you can find new things to sub to. If you’re the first to do so from lemmy.ml, congrats, your server now knows about that community and everyone else on there will start seeing posts from it in All.
It’s posts from all the communities lemmy.ml knows about, as opposed to all of the communities everywhere in existence. Given enough people and time the two lists end up being basically the same but obviously during a period of rapid growth like right now, new communities are popping up every second so it’s gonna take a little while until all the major instances know about them.
Tools like lemmyverse.net let you keyword search communities based on your interests so you can find new things to sub to. If you’re the first to do so from lemmy.ml, congrats, your server now knows about that community and everyone else on there will start seeing posts from it in All.