I believe we all have many online accounts - I, for example have an online bank account, credit cards, paypal, twitter, amazon, ebay, facebook, gmail, various forums, skype, apple id, even hacker news, and many, many more...
Using the same password for all your accounts isn't really possible because of different site limitations, not to mention the security risk you're taking. So I wonder how you manage all these passwords and keep track of them all safely...