Goodreads - See what your friends are reading.
Readernaut - We are a small community of readers, sharing our adventures and supporting each other as we persue a life of learning.
GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
aNobii - aNobii is a social network for listing books, sharing insights, and meeting people.
Bookicious - Find the best new book to read with books collections for makers, founders and entrepreneurs.
Riffle - Just good books and the readers who love them.