If you've signed up to receive e-mails from Sears, and then clicked on to join the retailer's "My SHC Community," it's likely you've been providing more information to more people than you thought. Even more troubling, it turns out that you're not just sharing information with Sears, but also with a company called comScore, which tracks and aggregates Internet browsing habits. Installing the software from Sears results in the installation of software called VoiceFive, which provides data to comScore. It's essentially spyware. comScore is the company behind the (disputed) numbers that indicated more people were stealing Radiohead's latest album than...