does anyone know why yahoo answers got shut down?

i know they probably wont tell us but back in nov i got a call from a policeman saying someone from ya was threatening me and he wondered if i was okay, and i wondered if others were being threatened too and if thats why they shut it down, i took a couple of wks off so the person would lose me, i miss helping people in the family section there and have been using it since 2008, so does anyone know why?