Behavioral advertising involves the compilation of detailed information about an Internet user’s online activities. That data, when collected, can be turned into detailed consumer profiles including articles read, web sites visited, and items purchased. These profiles are then used to determine which advertisements should show up on each consumer’s Web browser. In efforts to obtain more complete consumer profiles, some ad networks are now contracting with ISPs to buy the full web streams of the ISP's subscribers. The data collection, storage, and use practices of ad networks and ISPs pose risks to consumer privacy.