I gave a shout to the State Library of Victoria's dynamic website Inside a Dog last year, which was out of commission over the (Australian) summer period while it was being rebuilt. Well, the final touches have been touched and it's just been relaunched.
Designed specifically for readers of Young Adult fiction, and in its own words:
The Dog is a place to find great reads and share your thoughts via reviews, blogs and book clubs. Read about an author’s process with a new guest Writer in Residence each month, create your own reader profile or discuss the latest news in youth literature.
You can find it here: www.insideadog.com.au