Skoob
Skoob's name comes from the English word "books" spelled backwards. Through free account creation, the user creates a profile showing what books they are reading, have read, want to read, or are no longer reading, thus forming a  "virtual bookshelf". Users can also add missing titles and share their views on the books via reviews. On January 27, 2012, a survey was made that indicates that Skoob had more than 1,200,000 users.