DialMforMara is a user on octodon.social. You can follow them or interact with them if you have an account anywhere in the fediverse.
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I've seen some people compare Mastdon to IRC, I guess in the sense that IRC networks are (sort of) federated and anyone can run one. But IRC networks are closed and don't interoperate with other networks, so it's not a good comparison.
@tetron is Reddit a better comparison? Not being an IRC denizen, it was what my brain first compared federation to.
@DialMforMara Reddit is also centralized, though (a federated version of Reddit would be Usenet). The point I was trying to make is whether the protocol of a system inherently lets you connect to other systems with minimum trust required.