What are some alternatives?
When comparing BookAuthority and LibraryThing, you can also consider the following products
Goodreads - See what your friends are reading.
Bookicious - Find the best new book to read with books collections for makers, founders and entrepreneurs.
MyAnimeList - Start cataloging anime you've watched or manga you've read.
Booker.io - Booker is a networked book discovery platform to help people find must read book through people...
BookLikes - BookLikes is a free blog platform for book lovers. 100% independent and free.
Highly Reco - Book recommendations by awesome people