This month Marco Viscomi, a 27-year-old college student from Canada, was indicted in federal court for using a computer virus to blackmail teenage sisters into producing child pornography – of themselves.

He struck up a conversation online with the 17-year-old and talked her into sending him some risqué photos, then downloading a file from him that turned out to be a virus. Then he told her that he would ruin her laptop and send the photos to her parents if she didn't make explicit videos with her 13-year-old sister.

Parental monitoring is difficult to begin with. It's no longer just about the family computer, but about knowing what your teen is up to on the laptop, iPod, Xbox live, and smart phone. And to make it even more difficult, your teen is probably actively trying to hide their Internet activity from you.

7 out of 10 teens report hiding their online activity from their parents, whether by minimizing browser windows when you enter the room or using a device they know you don't or can't monitor as closely.

Your teens know how to use the Internet. They've been using it since they were old enough to talk. But do they know how to use it responsibly, without compromising their safety or just plain being rude or irritating to others? If your teens are online, which they undoubtedly are, they need to be aware of committing these 10 Internet faux pas.

In a world where cyberbullying is commonplace behavior and online rudeness is par for the course, here are 3 simple arguments for your teen to avoid being negative online and be more positive in his posts and texts.

1. Negativity Makes You A Target

Twitter is gaining popularity among teens, and it's different from other social networks in a lot of significant ways. If Facebook is like an after-school hangout, then Twitter is like scanning all of their favorite newspapers and magazines – as well as picking up  the latest school gossip. Here are 9 things parents should know about teenage Twitter use.

1. There is no minimum age to sign up for Twitter.

On average, how much would you say your teen goes online? Checks their Facebook? Sends text messages? If you're like most parents, you greatly underestimate both the time and the intensity with which your teen is involved with the Internet and mobile devices. Parental monitoring is important, if for no other reason than to have an accurate picture of what your kids are doing online, and how much they're doing it.

When my children were small, I knew everything they did, every television show they watched, every friend they had. If they wanted a snack from the cupboard or a new toy from the store, they had to go through me. I was in complete control. 

Back to school shopping sure is different than when I was a kid. The most high-tech item on my list was maybe a graphing calculator.

Now many schools are embracing new technology and running with it. Teachers send out class updates on Twitter and iPads are regularly used in the classroom, even for preschoolers. Maybe tablets and smart phones aren't on the official school list, but they're probably on your child's wish list for back to school.

Maybe you don't know what a “dumb phone” is, but your teens certainly do – and they don't want one.

One of my closest girlfriends hasn't upgraded to a smart phone yet: her trusty old flip phone serves her just fine. She does find herself several times a day, however, constantly apologizing for her lack of connectivity.

If we're in a group and someone says, “quick, grab your phone and take a picture!” or “get on Facebook to show me some pictures of your new niece,” she has to shrug and say, “Sorry, I can't. I have a dumb phone.”

The most common use of a teenager's smart phone, aside from texting, is social networking. Teens with smart phones are extremely likely to use them to go on Facebook, MySpace, or other social networking sites.

Recent statistics tell us that 9 out of 10 American teens who own smart phones use social networking sites. They also show that 9 out of 10 teenage smart phone owners have used their phones to go online in the last month.

Okay, the second statistic isn't too shocking: if you pony up for a shiny new iPhone and a data plan to go with it then it would be dumb not to use it. But here's the interesting part: teenage smart phone owners were less likely than their peers to go online using desktops or laptop computers. They preferred their phones.

Most of us think of parental monitoring in terms of protecting your child from bullying and predators, or maybe just protecting them from posting an inappropriate picture on a whim that could haunt them for years. Of course it does all those things, but simply knowing where our kids are online can clue us in on what's going on in their life.

Just by checking the Internet history on my home computer I know what news stories my husband is interested in and what projects my kids are working on in school. Did you know that just looking at the sites your kids have visited in the last few days and weeks can also give you a pretty good picture of what their life looks like right now?

The media loves the phrase 'bullycide,' and the kids like Phoebe Prince who take their lives in the wake of cyberbullying are never far from the thoughts of parents. But are we doing our kids a disservice by stressing the link between cyberbullying and suicide. 

When I picked up my friend's 10-year-old daughter Gabby for art class last spring, I asked her how her day had gone. “Good,” she said. “A guy came to our school and told us about his son, who killed himself because he was bullied.”

Out of every one hundred tweens and teens, how many do you think are cyberbullied? Twenty? Forty? Sixty? Actually, new research suggests that the actual figure may be much lower than we think. 

A new presentation of the results of two studies to the American Psychological Association this week shows that only 15% of kids were actually cyberbullied. The two studies surveyed a total of 5,000 teens.

Most of you reading this will think this is an impossibly low figure. We hear about cyberbullying every single day. It is all over our schools and in the news. How can a 15% figure be realistic at all?

It's the end of August, and back to school time is approaching once again. Whether your kids are dreading waking up early to catch the school bus or chomping at the bit to get back, it's time to say goodbye to summer vacation. The new backpacks, new clothes, and new graphing calculators are already bought and waiting. Back to school time is exciting, and it's also a great time to have a refresher course with your teen about Internet safety. 

I'll admit it. Smartphones are pretty addictive. They're fun to use, make it easy to stay in touch with anybody no matter where you are, and can do just about everything. I'm pretty sure you could spend a whole day on the couch without ever getting up except to go to the bathroom and eat – and maybe your teen has.

Have you seen your texting teenager and wondered whether they're really addicted to their smartphone?

SWAT-ting is a new trend that everyone is talking about. It also happens to be a nightmare for police departments around the nation.  SWAT-ting is an attempt to fool an emergency service into dispatching an emergency response team. The callers use services like Spoofcard to disguise the origin of the prank call, change their voices and add background sound effects. 

Does your teen have a smart phone? You've probably noticed that it makes a teenager's life a lot different than when we were kids.

No more asking to use the house phone at a friend's house to call home –  just text mom to ask her if it's okay to spend the night. No need to plan a night out – just check in on FourSquare and find out where everybody is. And that cute guy in Spanish class? You can get the inside scoop on him on Facebook without even talking to him.

All parents know that the Internet is a place that requires parental involvement and parental monitoring. There are cyberbullies, online predators, and identity thieves out there to worry about.

But the obvious dangers notwithstanding, did you know that some Internet uses and behaviors may also be linked to a teen's physical and mental health, too? Many studies suggest a correlation between certain types of online behavior and physical or mental health problems, from anxiety to obesity.

With the school year just around the corner, parents are busy getting ready. There are school clothes to buy, new backpacks to fill – but are also you taking the time to bully-proof your child?

Cyberbullying is present in any school: public or private, rural or urban, high school or elementary school. Help to avoid or lessen the impact of cyberbullying on your child with these 10 skills. 

1. Confidence. Identifying and being proud of his personal strengths will give your child a good feeling about himself that will make bullies less likely to target him.

With only two days left, make sure you RSVP for our #bk2school Twitter Party! Our host, Tim Woda, will be giving back to school tips to parents and discussing hot topics including cyberbullying, sexting, and SWAT-ting. We are also giving away cash prizes. The person who refers the most followers will receive a $100 gift card to Staples.