In addition, in contrast to sites and services whose primary target audience is children, and who must presume all users are children, sites and services that target children only as a secondary audience or to a lesser degree may differentiate among users, and will be required to provide notice and obtain parental consent only for those users who identify themselves as being younger than 13.
ENGADGET: FTC introduces changes to Children's Online Privacy Protection Act, parental permission now required to collect information