urbanfunscape:

The Dérive App ”gets you lost in your city and lets you share that experience with others.” It does this by serving up task cards calling users to search for architectural, urban, or social points of interest, such as following taxi, moving towards the river, taking a seat in the park, or finding a tree, say the creators. Users can create their own “decks” and formgroups where members collect their experiences online. The app was developed by Eduardo Cachucho, Babak Fakhamzadeh, Ian Barry, and Nora Noone.