Not all Facebook apps are dedicated to Farmville-style social games. Goodreads has the most popular book related app on Facebook, counting more than 150,700 monthly active users.

facebooklogo.jpgTo celebrate 3,000 new friends on our GalleyCat Facebook page, we’ve compiled a list of the top 20 book-focused apps on Facebook–we’ve ranked them in order of monthly active users. Be sure to check out our Publishing App Expo later this year as well.
Below, you can check out the complete list. These online tools will help you pick books, find book clubs, take quizzes, and swap books. What’s your favorite book related app on Facebook?

1. Goodreads: Place where you see what your friends are reading. (150,734 monthly active users)
2. Visual Bookshelf: See what your Friends are Reading, Write Reviews, and Recommend Books; Meet new People who are Reading your Favorite Book! (95,048 monthly active users)
3. weRead: lets you share your bookshelf. See what your friends are reading. Millions of books and reviews. Chuck a book at a friend, write reviews, take the Quiz, join a Book Club, get Book Recommendations, meet new People! (57,870 monthly active users)
4. aNobii Books App: Shelve, find and share books in Facebook. (32,259 monthly active users)
5. I’m Reading: List and rate the books you are reading. Browse through reviews your friends have written and discover some great new book ideas! (15,722 monthly active users)
6. Comic Books Beta: Stay on top of new comics as they are released each week from the major publishers such as Dark Horse, DC, Image and Marvel (7,601 monthly active users)
7. PaperBackSwap: share your information from PaperBackSwap.com on Facebook: books you receive, mail, and post as well as your current bookshelf, wish list, books I’ve read, and books to be read, ratings, and reviews. (7,339 monthly active users)
8. Excellent Books: Great Books (4,773 monthly active users)
9. Lendle: Kindle™ Book Sharing: Lendle is the easiest, fastest, fairest, and best way to lend and borrow Kindle™ books. (4,337 monthly active users)
10. AuthorPages by Rethink Books: provides solutions for authors to showcase their works on Facebook Pages. (3,871 monthly active users)
11. We Read: Shows the books you’re reading in your profile and feed. Rate, review, and discuss books. Discover users with similar books and what books are popular among your friends and other users. Give We Read a try! (2,340 monthly active users)
12. Avon Romance: We know what women want: great books, a satisfying story, a passionate escape…and a happily-ever-after. (2,209 monthly active users)
13. Tumblebooks: the first eReader App for Facebook! Read our ebooks anytime, see what your friends are reading, recommend books, and even write reviews! The app is preloaded with 20 free ebooks and 50 credits. Start Tumbling today! (1,644 monthly active users)
14. Dr. Seuss Books: Dr. Seuss believed that books and learning to read should be fun and exciting for children. (1,557 monthly active users)
15. BookBooN.com: BookBooN.com on facebook. Download free Books.
16. Bookshare Books: Quickly and easily list your favourite books, show off what you’re currently reading on your profile (in a clean, simple way), write book reviews and rate your friends’ libraries with Bookshare. (1,372 monthly active users)
17. BookYap Recommends: Tell us what you like and we’ll tell you what to read. Search for a favorite book to find other books you’ll love. Share recommendations with your friends to see what they think you should read next. (1,361 monthly active users)
18. The ULTIMATE Harry Potter Quiz: Think of this as an O.W.L.S Exam based on all Harry Potter Books and recently released films to test your knowledge about the magical world. Come and take this test, if you dare. (820 monthly active users)
19. YourNextRead: YourNextRead helps you find your next book. YNR is fun, easy to use and gives you great ideas thanks to the YNR community, who recommend books they have already enjoyed. YourNextRead is uniquely powered by YNR users. (339 monthly active users)
20. Book Clubs: The only application dedicated to making connections with like minded book readers. Join now and share your passion for books with others like you. Let the debates begin! (305 monthly active users)