yes, most definitely, you have to provide an incentive, best described as a quid pro quo: what's in it for me. you scratch my back and i'll scratch your's. if

yes, most definitely, you have to provide an incentive, best described as a quid pro quo: what's in it for me. you scratch my back and i'll scratch your's. if you are planning to build an app on the back of your users -- stacks and/or sharing economy type exploitation -- forget it. in a post edward snowden world, that gig is up. as for assuring 100% anonymity, when you get that figured out, please report back to hn, we'll all be dying to know how you figured that one out. however, if you decide to go this route and not purchase your data like everyone else these days, you will need to be upfront as to why you need personal info, how (what purpose) you're going to use it, and last but not least, how your respondants are going to personally benefit by giving up said data.