BookWyrm is a social network for tracking your reading, talking about books, writing reviews, and discovering what to read next. Federation allows BookWyrm users to join small, trusted communities that can connect with one another, and with other ActivityPub services like Mastodon and Pleroma.
Just made an account, and was glad to see an option to import from Calibre. My only gripe so far is that it’s pretty bad at recognizing books with no ISBN registered. It seemed to think a ton of my books were Harry Potter and the Deathly Hallows or The Fellowship of the Ring for some reason (or Marx’s Capital in French).