Help finding scenarios

I’m organising a project on tracking systems for elderly people. The scenario is as follow:

Elderly people, their relatives, friends and assistance personnel living in a specific area can carry a GPS device (it maybe their own mobile phone) which make it possible to visualise their position on a map (maybe google maps). They can also send short messages as in Twitter or Google Latitude. The visualisation may be possible both on a mobile phone screen or on a computer at home, possibly using applications like facebook (or any other application that support any kind of social interaction).

I’m trying to figure out how this scenario could define new services for 

• functional use (i.e. telemedicine, assistance services, ask for help)
• Persona use (i.e. reassurance when living alone)
• Social networking (i.e. inviting people for lunch, going out for a walk)

 

So, this is a call for contribution: any idea about how to use this opportunity?

I promise that I will publish a list of all the possible scenarios on this blog. We may also think of an award for the best idea, but if I promise for instance a trip to Aalborg I’m not sure I will have too many contributions.