1. Rioting: The police want to be able to see where people are. People who live in the area just want to get home. 2. Shopping trips in places where old buildi

1. Rioting: The police want to be able to see where people are. People who live in the area just want to get home. 2. Shopping trips in places where old buildings have been converted. Knowing that the lane you want to walk down is utterly packed with people is useful. 3. Beach trips. All your friends get this app and say, "meet us at the beach". On arriving, not being able to see them, you check the app to see the pockets of people. 4. Traffic congestion. It stands to reason that if lots of people have this app you'll be able to see where the busy roads are and the less travelled.