Targeted mailing is when the advertiser mails to a segmented list of addresses using geographic, demographic, and psychographic filters, among others. While a targeted mailing is often more relevant to the audience and can result in greater engagement and response, it tends to be expensive, especially as you add more refined filter criteria (also known as selects).
Different jurisdictions have taken different approaches to privacy issues with advertising. The United States has specific restrictions on online tracking of children in the Children's Online Privacy Protection Act (COPPA),:16–17 and the FTC has recently expanded its interpretation of COPPA to include requiring ad networks to obtain parental consent before knowingly tracking kids. Otherwise, the U.S. Federal Trade Commission frequently supports industry self-regulation, although increasingly it has been undertaking enforcement actions related to online privacy and security. The FTC has also been pushing for industry consensus about possible Do Not Track legislation.