Who says you can't still communicate after death. With Facebook, death may be a physical end, but it doesn't have to stop you from sharing. In fact, Facebook hasn't figured out how to remove members after they die. "Facebook, the world’s biggest social network, knows a lot about its roughly 500 million members. Its software is quick to offer helpful nudges about things like imminent birthdays and friends you have not contacted in a while. But the company has had trouble automating the task of figuring out when one of its users has died."
Obviously the user can't remove himself prior to death so who is to tell them after the fact. So even after death, you will live on in the Facebook world.