For kids ages 10 to 14 who are online, the Internet is a bigger time sink that TV. This is not surprising, but was recently released in a study by Google’s DoubleClick Performics.
I think most parents probably already knew this. For example, my high-school student watches about 2 hours of television per week, usually with me .. as there are a few trashy shows that we enjoy watching together 
Here are the exact numbers quotes in the New York Times article:
“The study found that 83 percent of Internet users in that age bracket spent an hour or more online a day, but only 68 percent devoted that much time to television.”
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Presumably less time on TV can only be a good thing. However you can’t read much into such a study without more information.
If the kids are simply chatting with each other after school there may not be much benefit if it’s only within a set group of friends. If they are networking around the world, being creative, taking charge of their own learning, using mindtools that assist learning…the potential is great. The world of Web2.0 with its mashups and networking is an interactive world, where the individual’s participation is interactively encouraged. These are exciting days on the internet. Let’s all take part in it.