Text source: liquiData
Think of a promising usage of location data gathered by your smartphone.
LiquiData is a multitouch application to explore your personal movement profile and to show other people engaging places by adding photos and comments with the help of your smartphone. It can be seen as a rating system that offers people the possibility to discover new spots in an unknown surrounding e.g. during a city-visit. Although a smartphone is not necessary to interact with the system, it offers you the possibility to give insights to your movements through the city and lets you compare your mental map with the reality. For instance, this system could give guests of a hotel (lobby) the option to share their walked trails and show other visitors their favorite coffee shops or parks.
More about the research project, technique interface elements, the idea and the Field of Application here.