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

Server stats:

12K
active users

Dismal Manor Gang

@FediTips @ruud The fediverse is an emergent phenomenon. Individual communities operate the computers and software. To join the federation, they agree to follow the federation rules. Mastodon and the larger Fediverse are very much a covenant governed thing.