Hey parents, listen up. A new survey shows that a majority of teens are concealing their online activities from you. Worst of all, the study finds, a majority of parents were not very concerned about their children's online activities, and 22% of parents have become so tired of technology that they've thrown up their hands in defeat.

The survey was conducted by McAfee, the world's largest security technology company. The survey of more than 2,000 teens revealed that a whopping 70% of them hide their online behavior from their parents. That number is up from 45% just two years ago.

The McAfee survey found that teens are primarily fooling their parents by clearing the internet browser history, closing or minimizing the browser when a parent walks into the room, and hiding or deleting instant messages or videos.

Not only are teens hiding their activities, they are also checking out inappropriate content online. According to the survey, 43% of teens have accessed simulated violence online, 36% have accessed sexual topics online, and 32% have accessed nude content or pornography online.

Another concern revealed through the survey — 21% of teens go online using a smartphone or internet-enabled mobile device. That means parents have little or no control, as teens can go online virtually anywhere free of parental oversight.

Just think of all the social networking occurring without your knowledge!

Fortunately, there are solutions.

There are steps parents can take to keep a closer and keener eye on the online activities of your children — especially when it comes to their handheld devices. Check out these tips and use them often:

1. Set Limits

Do not let your teen use a smartphone or other handheld device 24/7. That is simply asking for trouble. You must establish limits on time and usage.

2. Talk to Your Teen

Ask your teen to show you what they're doing online. It might be as simple as that.

3. No Privacy

You're their parent and you have a right to know what your child is doing online. You may be their Facebook friend — but you are their parent first. Get engaged and demand to see what they are up to.

4. Get Informed

Tell your teen that you want the usernames and password to each of their email and social networking accounts. If they refuse, threaten to cut off their handheld service. See how quickly they cave.

5. Stay Informed

The Internet, social networking sites and applications expand and change all the time. You must stay current. Find a website like Wired.com that discusses technology trends and make it one of your favorites.

6. Go Online and Snoop

Teens might create private email addresses or phony user profiles to avoid your prying eyes. You're too smart for that. Go online — check the big websites like Facebook, Twitter, Google+. Also check out apps like Instagram. Search your child's name and their friends' names to see what comes up.

7. Treat It Like a Diary

Your child is a minor. You are an adult. If you believe your child is hiding something from you, chances are there's a digital trail. Check their text messages, emails and apps, to confirm or (hopefully!) disconfirm your fears.

8. Check History

Even smartphones leave digital clues. Grab your teens' phone, go into the internet browser settings and check out the history. Which websites are they visiting? Do the same with apps on their phone. They are probably already logged in so you can see what pictures and comments they post. If you see something disturbing, confront them.

9. No Phones in Their Room

If you have serious concerns, forbid your teen from having their smartphone in their bedroom. They might be alone in there, but they have the entire world at their fingertips with a smartphone. Set boundaries. Stick to them.

10. Set an Example

In our connected world, parents are major consumers of smartphone technology, too. If you use your phone all day, your kids will think it's okay. Put the phone down, have a family experience instead.

Your kids can see what you're up to online, too. Make sure your Facebook posts and tweets are squeaky clean.

11. Have a Chat

Not online, but face to face. Explain to your teen why it's important not to search for inappropriate content or post inappropriate content online. Discuss the dangers of sharing too much personal information online. Enumerate the ways comments or posts on social media sites can haunt them at college application time.

Our kids are savvy, but sometimes they need things explained to them so they can comprehend the gravity of the situation. After all, that's what parenting is all about — teaching and guiding.

And now matter how smart the phone, it can't outsmart a parent.