@Gargron did you know there's a gaggle of us writing a chapter about Mastodon for a book :) Our chapter is called A 'pedagogy of small' in open, online communities: Emerging principles and values.
We're focusing on smallstories as a hashtag (and also talking about another example platform for youths to develop/share/practise writing (https://youngwritersproject.org/). @Tdorey is leading it.