Its like goodreads but for the fediverse . A private or public book list to keep track of books and to check out what others are reading.

Bookwyrm is specifically made for booksharing and book reviewing. While lemmy is more general. For instance, this is a link to the “a game of thrones book” https://bookwyrm.world/book/8138/s/a-game-of-thrones. Here you have reviews of the book. You can also add that book to your “to read” list aswell.