There's a built-in book catalogue powered by Wikidata in collaboration with @inventaire
BookWyrm is part of the Fediverse and accounts on BookWyrm servers can be followed by people from Mastodon etc, for example @mouse is the BookWyrm founder's account.
Anyone (except corporations) can start their own BookWyrm server by installing the software, and there's a managed hosting service for people who join the top tier on Patreon (https://www.patreon.com/posts/64768354).
