I only own a 360. Ive learnt from these forums that PS3 people nearly all also game on a PC and 360 people usually own Nintendo handhelds.
My prediction threads:
Wii U will sell under 40m units (made on 14th September 2012)
PS Vita will sell under 20m units (made on 30th September 2012)
Wii U will sell under 7m in 2013 - I was right