mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

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This "simple" version of the wikipedia Fediverse entry is cool

simple.wikipedia.org/wiki/Fedi

Richard Grant

@dansup Henceforth @stux shall be known as Man From The Netherlands. Arise, ye fair knight, and sally forth