Three years ago, an online friend was murdered. I didn't find out for over a month, because the family didn't know who to contact online. Because today would be that friend's birthday, here is a social will reminder.
http://ashi.livejournal.com/167634.html I found out through a web search, because I knew my friend's legal last name. I was lucky to figure it out. People disappear from online communities every day without a trace. If you want your online friends to know in case something happens, consider a social will.
Mine is pretty simple. I wrote down a list of forums, blogs, and IRC channels I frequent, and also contact info for some of my friends there, and gave it to my son. There are also websites set up with instructions or even notification systems. Here are a few instructional links:
http://blog.usa.gov/post/22261234875/how-and-why-you-should-write-a-social-media-willhttp://aussiestorageblog.wordpress.com/2012/04/25/updating-your-social-will/http://www.watoday.com.au/digital-life/digital-life-news/what-happens-to-your-facebook-when-you-die-20111220-1p3b3.html#content