@straightarrownews: I bought a detailed list of wealthy, suburban New Yorkers who smoke cigarettes. It took a credit card. Nobody on the list agreed to be on it, and buying it was legal. Exact Data's portal lets advertisers build lists on hundreds of factors, from location and household income to whether someone prefers Jack Daniel's to Bacardi, or if they cycle or knit. There are hundreds of brokers like them, and whether you can force them to delete you depends entirely on which state you live in. Mark Keierleber walks through the opt-out process for every state that has one.