I found this a very interesting use of social media for the future. Hopefully you will think so to!
In this TED video, Adam Ostro explains how it will be possible to live on as a digital persona after you have died in real life. Simply by using all of your contributions to social media combined with some smart data mining. It could be possible to create a digital you that can live on on-line.
If you are curious as to what you digital persona might post on twitter based on your current status updates, check it out here. I do not have a very active twitter-life, but I would like to know whether these predictions resemble your own in any way..