As an organization, what options exist for getting on the Fediverse?

TL;DR: There are many options!

Individuals will usually sign up on a public “instance”, or server capable of interacting with the Fediverse community. Many people have joined a public server such as Mastodon.social, but many other communities exist which are open to the public. Some people are members of private communities and some people even run an “instance of one” on their own web servers.

Organizations have these options: