TV accounts for 47% of the time American children spend with media

"Television use dwarfs internet use in both the number of children who surf the web and the amount of time they spend on it. The analysis found that during the week, most children spend at least three hours a day watching television, and that television use among preschoolers is the highest it has been in the past eight years. Of the time that children spend on all types of media, television accounts for a whopping 47%.
Heavy television viewing may even be partially responsible for the rising number of children who use the Internet. Parents in one study indicated that more than 60% of children under age three watch video online. That percentage decreases as children get older (the report suggests this is because school-age children have less time at home), but even 8- to 18-year-old children reported in another study that they consume about 20% of their video content online, on cellphones, or on other portable devices like iPods."
Source:  Data from Joan Ganz Cooney Center and Sesame Workshop, reported by Mashable, 14th March 2011