EXPLAIN that one of the first companies to track and target users online was Amazon.com. It created technology that could match people’s preferences with other users whose buying habits were like their own, and make recommendations on that basis. This kind of targeting worked, and Amazon’s sales grew rapidly. More recently, Amazon began to sell e-books (electronic books). With e-books, the company can track information about what you read, what pages you skip, and what you highlight. Amazon then uses this information to figure out what books to recommend to you (Pariser, The Filter Bubble, 2011, p. 29). Other companies, such as Netflix (which offers movies that you can order by DVD or stream online) and Pandora (which allows you to rate music in real time), have a similar model: Based on your choices, they try to determine your tastes. Then they recommend products that reflect those tastes.