Why was Malala’s diary so signignificant?

One day, Malala's father got a call from a BBC correspondent, Abdul Hai Kakar, asking if he could find a female teacher or student from his school to keep a public journal about life under the Taliban. Malala decided that she would do it; she narrated the events of her day on the phone to Hai Kakar each evening so they could be published. This brought Malala's story to the world.