Also, if you look in the "microblog" section of a kbin magazine, it collects Mastodon posts that use whatever hashtags the mag mods have set for that magazine and you can interact directly with the Mastodon users.
Eg. on @worldwithoutus the microblog section has these Arctic sea ice reports in it from Mastodon, because #Arctic is one of the magazine tags. It's really neat.