I still have a dead (as of 15 months ago) friend's facebook account in my contacts in case his family (none of whom I knew) wish to contact people again (it is through accessing his account there that they let us know what we had heard/guessed was true and let us know what the funeral arrangements were.
I've had to reduce the size of the "contacts" square on my Windows phone though as the larger sizes it flashes up pictures culled from various address books and for some reason picked his more regularly than anyone else's and having his face pop up almost every time I looked at my phone felt a tad odd.
That probably won't happen unless either he had his FB password written down somewhere in his will (if any), or if FB gives access to accounts of the deceased to relatives - which, I can imagine, would be a big hassle for FB.
It wouldn't be a bad idea to take up instructions for one's online life in one's will; Facebook accounts to make announcements on and close, domain names to transfer or disband, projects to close / reassign, online contacts to inform, etc.
I should get to that actually. If I died, nobody of the close friends I have online would have any way of knowing, and the RL people I know (few as they are) don't know them either.
I've had to reduce the size of the "contacts" square on my Windows phone though as the larger sizes it flashes up pictures culled from various address books and for some reason picked his more regularly than anyone else's and having his face pop up almost every time I looked at my phone felt a tad odd.