help the clueless

I was reading the daily_snitch and saw in the community section "fantasyverse is a new land community." My reaction then was "what is a 'land community'?" so I headed over to the comm profile, which in the about section also only says that it is a "land community" but does not explain what that is, but it apparently involves teams and challenges. I then head to the FAQs which unfortunately don't give a definition either.

At this point I assume that it must be some sort of incredibly common thing that everybody (except apparently me) in fandom is familiar with. I tried looking in Fanlore, but that wiki failed me too, because it does not have an article on this. I tried following affiliated links, but aside from ending up on a master list of land comms that showed me that there are a ton of them, I didn't easily find a link to a clear definition what they are either.

Could anyone on my flist give me an explanation what these communities are/do?