I worked for about a year (2007-2008) in the Young Adult area of a public library. The big commodity in there was the internet computers. I was surprised to find that, aside from Myspace, Facebook and gaming websites, the kids (mostly 12-15 year olds) really didn't do much with the internet, let alone any of the "web 2.0" stuff, like Twitter, Friendfeed, etc.
In my opinion, the teenagers use the internet a lot, but aren't necessarily very web-savvy. They don't seem to have very big attention spans; they just want to play games, chat and get on Myspace. Almost none of them knew what Twitter was when I mentioned it to them and they didn't really show much interest.
Just looking at people's profiles on Twitter though, it does seem that its mostly used by adults, 21+. That's just a quick estimate though, I could be wrong.
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In my opinion, the teenagers use the internet a lot, but aren't necessarily very web-savvy. They don't seem to have very big attention spans; they just want to play games, chat and get on Myspace. Almost none of them knew what Twitter was when I mentioned it to them and they didn't really show much interest.
Just looking at people's profiles on Twitter though, it does seem that its mostly used by adults, 21+. That's just a quick estimate though, I could be wrong.