This May 22 article, "Web Marketers Have a Way of Finding Out About You" by Susan Olasky in World Magazine quoting from New York Times, explains how a coupon printed from the Internet is packed with info about the customer who uses it. Coupons convey “a startling amount of data, including identification about the customer, Internet address, Facebook page information and even the search terms the customer used to find the coupon in the first place.”