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The number of social networking site users continues to grow. Who are these consumers?

The share of adult Internet users who have a profile on an online social network site has more than quadrupled since 2005, from 8% to 35%, according to a November—December 2008 Pew Internet & American Life Project survey.

Pew said adults still make up the bulk of social networking site users. But younger online adults were much more likely than their older counterparts to use social networks, with three-quarters of those ages 18 to 24 using the sites, compared with just 7% of Internet users ages 65 and older.