Ryan is a good kid. He gets great grades, he plays lacrosse (长曲棍球), and he is well-liked. So Jennifer and her husband didn't see any reason why their sixth-grade son couldn't have an Instagram account, until Ryan posted a photo of himself holding an empty beer bottle that his father had just finished. "My husband saw the photo pop up on Ryan's account and went up the stairs in seconds, demanding that he should take it down," Jennifer says. "I don't think my son realized how bad his picture looked. He was trying to be funny, but he's in sixth grade! Even if he was simply posing, that picture was inappropriate."

With the popularity of photo-sharing site Instagram, it's easy for parents to have a false sense of security. Unlike Facebook or Twitter, Instagram is only for posting pictures and with the 13+ age requirement and privacy feature, so it seems like an almost harmless site for children. How much trouble could they stir up? But that's not the fact.

Shockingly, some kids are paying for attention on social media. When Paula Pryor found a mysterious $700 charge on her credit card, the last thing she suspected it to be was payment to a company that helped acquire "likes" on Instagram pictures. "My son Hayden thought it was only ten dollars, but it was ten dollars per ‘like'," says Pryor.

Often, it's not your own teen that's cause for concern — it's someone else's kid. Megan Koster couldn't figure out why her daughter Delaney suddenly became so anxious about whether her panty line could be seen through her jeans. Finally, Delaney said that she was worried someone would take a photo and post it on Instagram. "I don't think I would have survived middle school if sites like this had existed back then," Koster says.