Efron is footloose but song-free in "17 Again"

He and his girlfriend and "High School" co-star Vanessa Hudgens have been the constant subject of celebrity magazine cover stories, and they are hounded by paparazzi.

In fact, Efron said he avoids social networking sites such as MySpace and Facebook where many people in their teens and 20s socialize these days. And, he flatly refuses to Twitter.

"I kind of value having people not know where I am or what I'm doing," he said.

(Reporting by Alex Dobuzinskis: Editing by Bob Tourtellotte)