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The government says the investigation shows that Webloyalty, Affinion, and Vertrue "trick" consumers into entering their e-mail address just before they complete purchases at sites such as Orbitz, Priceline.com, Buy.com, 1-800 Flowers, Continental Airlines, Fandango, and Classmates.com. A Web ad, which many consumers say appears to be from the retailer, offers them cash back or coupon if they key in their e-mail address.

Many of those who complained say they don't fear the ad because they aren't being asked to turn over credit-card information, according to the Senate report. But buried in the ad's fine print is notification that by entering their e-mail address, the shopper is agreeing to join a loyalty program and allowing the store to authorize marketers to charge their card each month, between $9 and $12.