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Younger children may try to lie about their age to get on to sites, like Facebook, that have strict age limits, said O'Keeffe. She said parents shouldn't condone this. "Facebook is geared toward teen age and up. There are ads and content on the site for an older group. Normally, you wouldn't let your 11-year-old hang out with 16-year-olds. Plus, if you let younger kids on these sites, you're teaching them that it's OK to lie."

Kids have always wanted to look at nude pictures, and today, taking and sending a picture can be done in a second," Primack said, adding that such pictures could come back to haunt children years later.

"We need more technology infrastructure, and pediatricians need to be ready to intervene and help educate young people and their parents on how to be more media literate, and how they can evaluate the types of things they're exposed to," said Primack.