The Pew Internet has a poll about Social Media and Young Adults that is worth checking out. Here is an excerpt:

Both teen and adult use of social networking sites has risen significantly, yet there are shifts and some drops in the proportion of teens using several social networking site features.

• 73% of wired American teens now use social networking websites, a significant increase from previous surveys. Just over half of online teens (55%) used social networking sites in November 2006 and 65% did so in February 2008.

• As the teen social networking population has increased, the popularity of some sites’ features has shifted. Compared with SNS activity in February 2008, a smaller proportion of teens in mid-2009 were sending daily messages to friends via SNS, or sending bulletins, group messages or private messages on the sites.

• 47% of online adults use social networking sites, up from 37% in November 2008.

• Young adults act much like teens in their tendency to use these sites. Fully 72% of online 18-29 year olds use social networking websites, nearly identical to the rate among teens, and significantly higher than the 40% of internet users ages 30 and up who use these sites.

• Adults are increasingly fragmenting their social networking experience as a majority of those who use social networking sites – 52% – say they have two or more different profiles. That is up from 42% who had multiple profiles in May 2008.

• Facebook is currently the most commonly-used online social network among adults. Among adult profile owners 73% have a profile on Facebook, 48% have a profile on MySpace and 14% have a LinkedIn profile.

• The specific sites on which young adults maintain their profiles are different from those used by older adults: Young profile owners are much more likely to maintain a profile on MySpace (66% of young profile owners do so, compared with just 36% of those thirty and older) but less likely to have a profile on the professionally-oriented LinkedIn (7% vs. 19%). In contrast, adult profile owners under thirty and those thirty and older are equally likely to maintain a profile on Facebook (71% of young profile owners do so, compared with 75% of older profile owners).

(Find the image above at the article from Power and Energy (pe) titled “Cordless electricity: is it the future?“)