What happen to our virtual account after we died

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Have you ever think about after you died, what will happen to your virtual account in the internet like your PTC site account, you e-mail account, your blogs account, or your website and many more things that you can think of in the internet. This question just have flashed in my mind and that really make me think a lot. Do I need to write down all my account username and password for every site that I have join or website that I am managing it somewhere so that when I died, someone can continue my job or use that account, or to tell the site that this person have deceased and to close the account. What is your though on this? Have you ever think about it or have you already done something about it?