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BookWyrm - a fediverse Goodreads clone, if you're looking to break away from Amazon!
(joinbookwyrm.com)
Pretty straightforward: books and literature of all stripes can be discussed here.
If you're interested in posting your own writing, formal or informal, check out the Writing community!
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
I've signed up for it, it's got a few books that I imported from Goodreads but I like it overall.
I think Storygraph is the best reading social media but happy to support something like this.