Check the full article and related Pew report for more details
Internet users from all age groups increased their use of social networking from December 2008 to May 2010, with use by people 18 to 33 rising to 83 percent, from 67 percent. But those in every generation 45 and older more than doubled their participation. Adults 74 and older who are online quadrupled their social networking presence, and that now stands at 16 percent.
Teenagers, by contrast, cut back on traditional blogging by 50 percent from 2006 to 2009.