Over the past few weeks, Nokia held the first Apps for Change contest, inviting people from around the world to suggest a mobile application to benefit society — which Nokia has agreed to develop. The winners also get to steer a $10,000 contribution to a nonprofit organization.
The winning entry was Red Heart, submitted by Sana Refai and Kamel Seghaeir of Tunisia. The entry put it this way:

This application will help you to generate your blood donor’s networks. In case of emergency, you (or someone else) activates the search of your nearest person in your blood donor’s connection (GPS Localization) and contacts him to come give you help. By installing the application, you precise your blood group. When you add a new entry, the application decides whether your connection can be a donor or not according to her/his blood group. The application can be extends from a private network to a public community by creating a website gathering all blood donors worldwide …