Demographics of Facebook and Twitter
This piece in ReadWriteWeb says the younger generations are starting to get more into Twitter than Facebook. I'm not seeing that, myself, here at Dartmouth. 
As Facebook Ages, Gen Y Turns to Twitter
Written by Sarah Perez / November 5, 2009
Facebook is getting old. No, people aren't getting tired of it, it's actually getting old, as in its population is aging. In May of 2008, the median age for Facebook was 26. Today, it's 33, a good seven years older. That's an interesting turn of events for a site once built for the exclusive use of college students. So where are today's college students hanging out now? Well, to some extent, they're still on Facebook, despite having to share the space with moms, dads, grandparents, and bosses. Surprisingly though, they're also headed to another network you may have heard of: Twitter.
As it turns out, Gen Y likes Twitter...Well, maybe not, but they are using it
Over the course of the year, there have been countless reports - some more substantial than others - but all with the same message: Generation Y is just not interested in Twitter. The reports generally cited members of this demographic as saying Twitter was "pointless" and "narcissistic."
Apparently, that's beginning to change. Well, maybe not their perception of Twitter, but certainly their use of it. Today, Twitter is now the second-youngest of the top four social networking sites. Its median age is 31. MySpace's is 26, LinkedIn is 39, and, as noted above, Facebook is 33.
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