I think accounts are instance specific. You can send messages/posts to anyone using the same protocol though. Unless something changed recently.

I've thought about gutting an old toaster, like for toasting bread, to house a raspberry pi and instead of slices of bread you can stick harddrives into the slots. Two bays. The prime motivation is just to be able to say that I can run Linux on a toaster. Next step would be running Linux on a dead badger I guess.

I learned enough ed(1) to be able to do quick edits in smaller files, and it is actually quite nice to have that simplicity without all the bells and whistles of modern editors.