Goodreads allows readers to do so much. You can see what your friends are reading, have read, or have written reviews for. Friends can send you recommendations of books they think you might like. It's a huge virtual book club.
Readers are able to track books that they want to read, are currently reading, or have read. I keep track of how many books I read during a calendar year. With Goodreads, I don't have to keep a written list anymore. I can just look up the item on Goodreads using title or barcode (and because I have the smartphone app, I can just scan the barcode) and add it to my bookshelf. Bookshelves can be customized, so I'll be able to separate my 2014 reads from my 2013 ones. So far in 2013, I've read 63 books! You don't have to separate just by year, you can organize your books by genre, author, pretty much by anything you want.
If book recommendations and peeking at your friends' reading lists weren't enough, Goodreads has some more fun stuff for you. You can set challenges for yourself (like reading 100 books in 2013). You can link to your facebook profile, so books you're reading, have read, or have reviewed/rated will automatically appear on your feed. Occasionally, you may even receive exclusive invites from Goodreads to special events (like Q&As) with authors you've rated or reviewed.
Goodreads has opened up a whole new world to Reader's Advisory for book lovers everywhere. Readers are now able to get recommendations and review books from anywhere in the world.
Now if you'll excuse me, I'm off to rate another book.