Link to July 6 adweek.com post, "Nielsen: Kids Flock to Web. Their usage rate far outpaces that of general online population".
Excerpt: According to Nielsen, kids 2-11 spent nearly seven hours online per month five years ago vs. 11 hours a month in 2009, with boys spending slightly more time on average than girls. That disparity is perhaps most evident in online video viewing, as boys accounted for 61 percent of video streams among kids on the Web.
11 hours per month? That leaves plenty of time for reading.