Readmill makes each and every book its own self-contained social network, allowing readers to discuss, share and review from inside of the e-book. If you find a passage you like, you can highlight it and comment on it right from within the book. Other users reading the book and even the author can see these comments and add their own thoughts, starting a discussion within the book, without ever having to leave it.According to the Readmill.com website, however, it's noted that discussions are not limited to the app:
Highlight and comment on passages as you read, and share them with friends and followers. Every highlight can be viewed on the web (at Readmill.com), making it easy to start a discussion with other people, even if they are not using Readmill.Readmill supports ebook formats ePub, PDF and Adobe DRM, and books from stores such as Kobo and Feedbooks can be bought and brought into Readmill. The Readmill.com website will allow you to manage your library and store all of your books in the cloud for free. Readers are invited to join their community of readers and authors, and Readmill will periodically send emails recommending "books of interest," based on what is on your reading shelf.