My wife and I used to keep all kinds of note about how to handle various accounts and communications if we died. Over time, we realized that what matters is our friends and family, not our online presence. My only note that is left is "Cancel my credit card - everything will get sorted out and deleted once bills aren't paid."

I'm not trying to diminish the importance of our online lives while we live. It is a big part of our lives. But after we are gone... different story.