Better idea: In the event that someone does not log on in one years time...you send emails to some of their most highly contacted friends...and ask them if their friend is unable to use their account due to death. If you ask respectfully and explain why the site does this, I'm sure users will appreciate it. The other option is for users to set up a sort of "emergency contact" such as a sibling, parent, or cousin who is also on Facebook. After a set period of time, the password may be given to emergency contact. However, you must give users a full disclosure of what "emergency contact" means, what the site will automatically do after one year's time inactivity, etc. You must also be able to NOT name a contact, and instead have your account deleted. Even two years would probably be fine. If I let my account go inactive for more than two years, I would certainly prefer to have it automatically deleted or turned into a memorial page.