(and how to audit your phone's application traffic yourself)

It might sound weird to accuse Foursquare of collecting location data since that is the whole point of the service, but Foursquare is overstepping its bounds by constantly keeping track of their users' every move (and more) -- even if they never open the app.

The Foursquare app contacts the service every ten minutes, providing a list of minute-by-minute locations (including timestamp and accuracy data), battery level, charging status, internet connectivity status and nearby wireless access points (complete with timestamp, MAC address and signal strength).