Dead Network

This morning on the bus I was thinking about the future of the internet - specifically, social networking sites like Facebook and Myspace.  I bet that in 40 years, half of my 'social network' will be dead.  That's a fuckin' weird thought.  I don't think that I want to live a life where half of my social network consists of dead people.  I'm kind of assuming that the profiles will stay there once the registrant has expired, which is just plain weird.  Obviously, there will come a time when all of my social network is dead (along with myself), since I will not be around to confirm new contacts.  Does that mean that nobody will ever be able to view my profile?  (Assuming that I do not change the current privacy settings)  It feels sort of like that 'tree falling in the woods' crap.  If nobody can view my profile, does it still exist?  Maybe in 300 years, somebody will decide to unlock all of the previously private profiles so that some cyber-archaeology can take place.  I wish I could do that right now and see what people 300 years ago would've put on their profiles.  I bet a lot of status updates would've been like 'Charles Wilson is three more days until Crusading!' or 'Elizabeth Smith is stil nawt litrit.'