The Pew Internet group has recently released their latest report on US use of social media sites – it’s growing…

Today, 72% of online adults use social networking sites. Although younger adults continue to be the most likely social media users, one of the more striking stories about the social networking population has been the growth among older internet users in recent years. Those ages 65 and older have roughly tripled their presence on social networking sites in the last four years—from 13% in the spring of 2009 to 43% now.

It looks like Twitter is still lagging behind social media sites with about 18 percent of adults using it.

It’s interesting to take a look at who is using social media sites. There’s a slight difference in rural (69 percent) versus urban (74 percent) use. Age is still a differentiator – 89 percent of young adults (18-29) are users while only 43 percent of seniors (65+) are users. Although that 43 percent reflects a big leap since the last report.