Do you know, or know of, any teens who do not participate in online social networking?

I’m not asking if there exist any teenagers somewhere in a third-world country who have no computers.

I’m asking if you personally know, or know of (at close second or third hand), middle-school and high-school-age youngsters who refrain from participating in any of the social networking sites. Presumably they are among peers who do.

If so, what can you tell us about them? What kind of people are they?