E found this article in the 20 Sept 2010 print version of the Wall Street Journal. I found it online here. It is a long article with quite a lot of other links to related articles but it is worth reading. I think it is a must-read for parents with young children and teenagers who use the Internet.
It is a good and eye-opening article about what takes place when our kids visit websites to play games, network socially or even to study. We are more ''exposed' than we realise when it comes to how much information on personal details and internet activity websites can get with the tracking devices they install.