Goodreads - See what your friends are reading.
BookWyrm - Social Reading and Reviewing
LibraryThing - A home for your books.
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
BookLikes - BookLikes is a free blog platform for book lovers. 100% independent and free.
Sebangsa - Social and mobile platform developed and designed for Indonesian users.