Message activation delay?
To be properly useful, it needs to somehow find out (obituaries?) that you've died so it can release your screed immediately. This serves the dual purpose of letting people know you've died in a funny/awful way (depending on whether you like them or not) and giving you a chance to give a last message of joy/bile to those who were already aware while your death is still very fresh in their minds.
It would be embarrassing indeed to be given a year to live by the doctor, set an activation delay of two years just to be safe, only to unfortunately have a miracle cure and forget to reset the timer, and tell everyone you're dead when you're not. It would unnecessarily upset those who (hopefully) like you, and cause undeserved joy for others. Though if you later ran into them at the grocery store the look on their faces might be worth it!
Biting the hand that feeds IT
