More than 8 in 10 parents are worried about how online advertisers are tracking their teens' behavior, according to a Pew Internet Project and Berkman Center for Internet & Society survey. That figure even topped worries about how teens interact with strangers online and manage their online reputations. The findings come as the Federal Trade Commission pursues additions to the Children's Online Privacy Protection Act, which is aimed at protecting preteens, among other initiatives.

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