According to a new report from Netpop Research, 76% of all U.S. broadband users actively contribute to social media sites in one form or another, and 29% contribute regularly to social networking sites. Among these social networkers, Facebook is quickly catching up to MySpace, though iMeem, LastFM, Digg, and LiveJournal are also very popular with college students. The report also compares the online habits of these social networkers with those broadband subscribers who choose not to contribute to social media sites and finds a number of very interesting differences. Read the full article.