bullmancuso.com is an imaginary friend with a personal home page. This is a well understood concept. It could be a blog, or an about page, a resume. A web page that is associated with a person.
There could be subdomains like:
If he set up a Mastodon server, what should it be called?
Or is the Mastodon server so important that it should take the top spot, with just the naked domain.
We're also going to need domains that serve as API glue, just like we have for Twitter. What should those be called? That's a less important question because the only places such a domain would appear is in an app that interfaces with Mastodon servers.
Comments here.