SEATTLE -- A new study finds teenagers who use social networking sites, like Facebook and Twitter, are most likely to drink and use drugs compared to teens who avoid the social networks.

About 70 percent of teens say they use social networking sites every day. The National Center on Addiction and Substance Abuse at Columbia University surveys teens every year in an attempt to track drugs, alcohol and tobacco use. This year, questions about social media were added.

The study states that teens that use social networking sites are twice as likely to use marijuana, three times as likely to drink alcohol, and five times as likely to use tobacco.

Some experts say kids see images of teens drinking and using drugs online, which takes the shock value out of bad behavior and leads some to think it's what everyone is doing.

Some people disagree with the study's findings.

I think it is just about their family life - what is going on at home, how they perceive things, what the situation is around them, said Chris Southard.

Some viewers on our Facebook page say they monitor their kids' social networking habits closely so they know what's happening on the websites.

I will look through dressers, clothes, Facebook, PC's, whatever I want to make sure my child is safe, writes Kelly. They will hate me now, but one day they will love and thank me.

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