Facebook now has an application (commonly referred to as an "app") called "If I Die" that allows a user to post a final message on his or her Facebook wall when the user dies. A user selects three "trustees" who are Facebook friends that will verify the death of the user. After the trustees confirm the user’s death, Facebook posts the user’s "If I Die" message. Eran Alfonta, the app’s co-founder, said the app was created because "[w]e all have things to say and don’t necessarily have the audience with the patience to hear us. Actually we all want to leave something behind, we all want to leave a stamp behind us." For now, the app posts the "If I Die" message on the user’s public profile page, but the creators are working on changes to the app which will give users the ability to send non-public messages, even to non-Facebook users. The number of app users is expected to hit 100,000 within a couple of months.
See If I Die: Facebook App Lets You Leave Sweet Last Words, Mashable Social Media, Jan. 6, 2012.