Use of the Internet at least requires basic literacy of reading and writing. But methinks, that demographics of Internet use has broadened.

Some major North American sources. First 2 resources are one of the best for generic Internet use analyses in North America to begin research.


http://www.pewinternet.org/PPF/c/2/topics.asp

http://www.statcan.ca/Daily/English/080612/d080612b.htm Statistics Canada is a federal govn't agency. They do annual surveys on Internet use habits of Canadians.

Not sure about the quality of this mega-site. Harder to get a grip on their data collection methods.
http://www.internetworldstats.com/stats14.htm