You can just ask people to dox themselves, and no matter how egregious and pointlessly revealing the information is (for example why would anyone be interested in your timezone? what does your marital status have to do with your linux preferences?) people will happily share it anyway, that's how retarded /g/ is
Including random red herrings like pizza topping also increases responses, since people have toddler psychology and are easily distracted
I'm 99% sure if I asked "what's your favorite movie director, social security number, and wallpaper?" people would happily give it up