51% of U.S. Web surfers use social networking sites
More than half of all adult Internet users in the United States either visit or maintain a profile on at least one social networking site, according to a study conducted by Forrester Research.
Forrester says that the growth of users who consume social media such as podcasts, videos and blogs has grown almost as dramatically as social networking Web site users. The survey classified a full 73% of online U.S. adults as spectators, a big increase from the 48% that it classified as such in 2007. Additionally, the number of users who consume no social media has fallen from 44% in 2007 to 18% this year.