I have just registered their and I already like it very much.Perfect place for all Harry Potter fans! My nickname is PurpleFrog9176, if anyone is interested (you can add friends there). The most interesting thing is that you can't choose your username, they give 5-6 options and you have to choose one.
I'm currently hanging out thon this site and it seems to me that you can do WHATEVER you want there : make friends, collect objects, make your own spells, play games, earn points, etc. And all the illustrations are so real and there is also a great amount of matirials, which you won't find in the books or movies. It's worth spending 5 minutes on signing up. I might update this post.
Previously: 16 icons