Gregory's Server
The WordPress ActivityPub plug-in allows for following via the network. But you can't embed text objects (like a blog post) in a Mastodon post, which should be possible.
I don't know if WriteFreely allows for this.
WriteFreely is still a toy. WordPress has decades of production service. And it's FOSS.
Medium and Substack can go screw, however.
@ParanoidFactoid @zleap @aral
Meanwhile, it just occurred to me to have a look at what the Twenty Twenty Three WordPress theme is like. I got excited when I saw how plain and simple it looks, but they've totally changed how to customise it. So the old menus option under appearance is gone and I can't for the life of me figure out how to have my sub menus sitting under the main menus anymore. Typical... they finally have a nice default theme but they make everything else worse.