2008 Digital Future Report: Surveying the Digital Future / Center for the Digital Future at the University of Southern California Annenberg School, 17 January 2008
Summary
http://www.digitalcenter.org/pdf/2008-Digital-Future-Report-Final-Release.pdf
Full report may be purchased online
http://store.digitalcenter.org/
"This year's report contains a large module looking at on-line communities and social networking in great detail. Readers can compare the social networking data and correlate it to seven years of attitudes and behaviors on-line. As usual, the report continues to track off-line media use, purchasing both off-line and through e-commerce, social and political activity and a wealth of other data."