When The New York Post published a story that a new coffee-table book, Bandstand Diaries, revealed stories about the secret gay lives of some of the dancers, sales of the book went through the roof.

This article was updated at 7:49 p.m. “American Bandstand” has got a good beat, and 19 Entertainment’s Simon Fuller would like to dance to it. Fuller, the brain trust behind Fox’s megahit “American ...