I like twitter. I use it pretty frequently, more to read than to actually post. I follow Rachel Maddow, Obama, and NPR, so I got my important news covered, and then I follow Amanda Palmer, Neil Gaiman, Zoe Keating, and a few other musicians/authors, and they either just give me interesting tidbits, or in the case of both AFP and Zoe Keating, they post about artists rights, and how to interact with fans sans record labels, and stuff like that, like independent business models, and whatnot. Its really really interesting.
I thought it was really stupid, and then I joined, and I realized how great it was. Facebook and myspace not so much. They were dumb before I joined, and still dumb once I did.
And I'm 21. So I guess a 15 year old would probably think I was old.