'Google has this handy and terrifying feature called Timeline, which shows you everywhere you've ever been, how many times you've been there, and how long you've been there each time. It collects data from your phone, constantly if you have an Android, and if you have an iPhone, it logs your location every time you open the Google Maps app. Nothing disappears: your every movement is a collection of data points, fed into algorithms that use this information to do everything from alert you to traffic jams in your area to notify you when you're running low on nappies for your newborn.' (Publication abstract)