How do you remember how you log on! Everytime I go to log on to something I have to sit and try to figure out what email I used and what password. Pain!
I love goodreads because when your friends add a comment, or change their bookshelves, it sends you an email (like bebo), but what makes goodreads different is - when you click on the link you're automatically logged in! Much nicer than the other social networking sites I've been using!