What are some alternatives?
When comparing BookAuthority and Bookicious, you can also consider the following products
Goodreads - See what your friends are reading.
Four Hour Book Club - 300+ Books recommended on the Tim Ferriss Show 📚
LibraryThing - A home for your books.
Booker.io - Booker is a networked book discovery platform to help people find must read book through people...
Highly Reco - Book recommendations by awesome people
Bookstck - A curated bookshelf (+100 books) made by entrepreneurs