YM (magazine)
It began as two separate magazines: Compact and Calling All Girls. Compact was aimed at older teenagers. It was first published in 1932. Calling All Girls was intended for younger girls. It began publication in July 1941 after a teen column in Parents' Magazine produced a positive interest from readers. It was the first magazine for girls. Contents consisted of comics, fashion advice, and short stories. It was originally published four times a year, but soon became published every month. This was because it was popular. By 1945 it was selling 500,000 copies of each issue. The average reader was aged 13. The magazine never appealed to older teens or fashion advertisers because of its emphasis on comics.