Goodreads - See what your friends are reading.
LibraryThing - A home for your books.
GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
Delicious Library - Delicious Library 3: Catalog your books, movies, music, software, toys, tools, electronics, & video games. Archive your life.
Bookicious - Find the best new book to read with books collections for makers, founders and entrepreneurs.
Read This Twice - Verified book recommendations from people we look up to