In case you missed it, #BookWyrm is the Fediverse's alternative to Amazon's Goodreads.
BookWyrm lets you keep track of what you're reading, publish book reviews and discover new books from other people's recommendations. It's part of the Fediverse, so you can follow BookWyrm accounts from Mastodon etc. More info at:
There are BookWyrm servers where you can sign up at:
➡️ https://joinbookwyrm.com/instances
You can also follow BookWyrm news at @bookwyrm