Popular Near Me
Apple used to have a feature on the iPhone called Popular Near Me. By collecting data from all of its users wherever they went, Apple could tell you what apps were most frequently used by other users in your area. In 2015, I recruited college students from thousands of miles away via Craigslist to share with me what this feature displayed on their iPhone, as a way of taking a "reading" of their college campus. Apple was collecting their data, as was I.