Riffle - Just good books and the readers who love them.
Goodreads - See what your friends are reading.
aNobii - aNobii is a social network for listing books, sharing insights, and meeting people.
BookLikes - BookLikes is a free blog platform for book lovers. 100% independent and free.
BookSloth - Book Sloth lets you add books, post and see reviews as well as interact with other readers.
Read This Twice - Verified book recommendations from people we look up to