"The Wall Street Journal examined 50 sites popular with U.S. teens and children to see what tracking tools they installed on a test computer. As a group, the sites placed 4,123 'cookies,' 'beacons' and other pieces of tracking technology. That is 30% more than were found in an analysis of the 50 most popular U.S. sites overall, which are generally aimed at adults. The most prolific site: Snazzyspace.com, which helps teens customize their social-networking pages, installed 248 tracking tools. Its operator described the site as a "hobby" and said the tracking tools come from advertisers. Starfall.com, an education site for young children, installed the fewest, five."