Find out the locations of all the people you direly want to avoid.
The technology can make it easier to approach strangers, and alter our sense of belonging.
In six global cities.
Presuming your friends use Foursquare, of course.
In Instagram photos.
What Foursquare can teach us about how people use a city.
The Foursquare-style Chromaroma program tracks London Tube riders wherever they go