I found this in a study of underprivileged kids given the internet: “more visits to the following categories of websites predicted better academic performance in mathematics: technology, music, corporate, web services, downloads, MSN/Yahoo, pornography, search engines and information. More visits to these categories of websites predicted better academic performance in reading; technology, download, MSN/Yahoo and pornography.” Surprisingly, they didn’t advocate more porn access in schools…
From Jackson, L. A., Samona, R., Moomaw, J., Ramsay, L., Murray, C., Smith, A., et al. (2007). What Children Do on the Internet: Domains Visited and Their Relationship to Socio-Demographic Characteristics and Academic Performance. CyberPsychology & Behavior, 10(2), 182-190.