Among adults, MySpace is the most popular online social network.⁶ Half (50%) of adult social network users age 18 and older are on MySpace, while 22% of adult social network users have an account on Facebook. Another 6% have an account on LinkedIn, 2% have an account on Yahoo, and 1% each have accounts on YouTube and Classmates.com. Another aggregate 10% of adult online social network users have profiles on other sites, including BlackPlanet, Orkut, Hi5 and Match.com.

There is some variation in the types of people who tend to use each of the top three social networks. Typically, MySpace users are more likely to be women, Hispanic or black, to have a high school education or some experience with college. The median age of a MySpace user is 27 years old.  Facebook users are more likely to be men and to have a college degree. The median age of a Facebook user is 26 years old.  LinkedIn users are more likely to be men, to be white and to have a college degree. The median age of a LinkedIn user is 40 years old.