Goodreads is a book review website that has hit 20 million users total after hitting 10 million around a year ago. Goodreads allows users to share reviews on books. Amazon acquired Goodreads this past March. Goodreads founder Otis Chandler said that the website has hit 25 million total reviews and users added over 620 million books. Goodreads said that their growth is due to a well-rounded library of reviews that became available across all genres. There has also been an increase in international usage.