Book Glutton takes the idea of a book club, the kind where you and others read the same book, meet and discuss it, and combines it with social networking. Once you sign up, you can sign up for a free book to read within your browser. As you turn the pages you can interact with the others reading the same book by either chatting with them in real time or by trading annotations on the book pages themselves. That's right, you can mark up the books in the margins and leave little notes either for yourself or others to see. Of course you can create a profile where you can list your favorite books, upload photos, and connect with others to share and explore new literary discoveries.