nefa. ss my own bu toh ucse to it keep in . with clients. >> reporter: only 16% of teens tweet.en baby boomers have them beat. a columnist for federal computer week and a twitter- holic says he is not surprised. >> text messages and web access east cost money. and they would rather use the money they do spend to send text messages directly to their friends. >> this is my work phone. it has unlimited texting and unlimited internet. that means i can twitter all day, and it doesn't cost a thing. >> if you look at the people that are the most popular, they tend to be computer programmers, marketers, salespeople, entrepreneurs, celebrities. >> reporter: many teenagers don't even have twitter in their vocabulary. >> i was kind of curious about twitter. i still don't understand it. >> reporter: and they may not need to. >> my friends are at school. so i could talk to them at school. >> reporter: we adults can't see our friends every day at school. so many people we know might live out of state as well. adults can use the twitter network, and it's something teens generally don't do unti