I was on my phone the other day and saw this on the google play store. I just thought it was interesting seeing as android users are more than 100% more likely to be PC users (source: http://aka-img-2.h-img.com/media/img/blog/droid-vs-ios.png).
After looking at who Google thinks I am on my Google ad profile it has nailed me for most of my interests such as technology and gaming. (Although it thinks my age bracket is 35-45 when im actually 21). It was rather accurate in recommending me tech and gaming magazines. Although oy did try and slip a recommendation for Men's Fitness those cheeky gits.