So my question today is:
How will mastodon be governed? What's to stop the bad guys opening up instances and joining the federation?
Who says that subversive content is not allowed and should be taken off the instance, or banned.
Lots of challenges for a nascent platform I think..

@eileenb I think that thinking about Mastodon as a blog rather than as distributed Twitter will help.

That is, anyone can post stuff on their blog, people don't have to subscribe or comment.

The owner of the blog gets to moderate / delete comments.

Think about who your owner is.

Also: it's open source, and under the AGPL. If I make local, interesting changes, I am required to share them back. But different instances could run different plugins.

@boris another nice solution - that might help many newbies - the owner of the instance is king....
but as iuventus (roman satirist) said in satire 5 (I think) 'who will guard the guards'
We shall have to wait and see...