Goodreads

Goodreads is described as “Facebook for books.” It is a bookish social networking site where you can find out what your closest 20 million friends and colleagues are reading. Their mission is "to help readers find good books to read." You can find book reviews, send and receive recommendations to friends, follow favorite authors, and sign up for a reading challenge. It has become a community of passionate readers, and their highly anticipated annual Best Books list, or the Goodreads Choice Awards, are the only major book awards decided by readers.