On Mastodon (and similar socials like Twitter and Facebook to a certain extent) you mostly follow people instead of themed groups like Usenet. You set up your

On Mastodon (and similar socials like Twitter and Facebook to a certain extent) you mostly follow people instead of themed groups like Usenet. You set up your "wall of postings" (the "feed" or "timeline" in the jargon of socials) by following (subscribing to) the people you're interested in. On Mastodon you can also follow topics by following "hashtags", which are the sets of posts by any user tagged with a string preceeded by a hash character. For example, following the hashtag #retrocomputing will bring in your timeline the posts about that topic. So, on socials, you typically scan your feed and the feeds of any additional hashtags you're interested in. For each post you can reshare it, reply (comment), or like it. Some additional resources: 1) https://opensource.com/article/23/1/mastodon-beginners-guide https://opensource.com/article/23/1/mastodon-beginners-guide 2) https://github.com/joyeusenoelle/GuideToMastodon https://github.com/joyeusenoelle/GuideToMastodon