1.) Many grocery stores chains offer customers a card they can scan when they check out, and offer discounts to people who do so. To get the card, customers must give information including a mailing address and e-mail address. The actual purpose is not to reward loyal customers but to gather data. What data do these cards allow stores to gather, and why would they want the data. 2.) Online retailers such as Amazon.com help data products that customers buy, and even products they look at. What does Amazon hope to gain from such information?