Did you know that adults still make up the majority of social networking site users? A survey in December 2008 by the Pew Internet & American Life Project showed that the number of adult Internet users who have a profile on an online social network site has more than quadrupled since 2005 (from 8% to 35%).
Although adults make up the majority of social network users, younger online adults are more likely than older adults to use them: 75% of adults aged 18-24 vs. 7% of those 65+. The following chart shows US adult Internet users who have created a profile on a social networking site:
If you include occasional visitors to online social networks, in addition to those who have posted profiles, the number is 70.2% of US Internet users ages 15+, according to the following chart from comScore World Metrix: