Sorry for the long reply, no worries I don't take it as a critic. It's actually more like what amagumori said: the dichotomy is "everyone in the checkout line c

Sorry for the long reply, no worries I don't take it as a critic. It's actually more like what amagumori said: the dichotomy is "everyone in the checkout line can see what i'm buying" vs. "all people who know my first and last name can view my entire credit card transaction history". If you see my license plate in the street today, I wouldn't care at all. I wouldn't be fine if you published that information in a "where is everybody right now" wiki. From that wiki a stalker would have it really easy to ruin my life; a burglar could break in at the good moment; an employer could know I visited their concurrent, probably for an interview; I go to this church/mosque/synagogue/... : now you know my religion;the neighborhood association could see I have 'too many' (for their standard) friends (or AirBnB customers?) visiting; marketers could see I go often to store X,Y, on vacation to Z, that I'm more of a Fast food Mc lover than a BK, ... Also: So taking a photo of (or making a memory of having seen) doesn't violate your privacy . For many Europeans countries it does violate the privacy, if that photo has no public information purpose. For instance: http://uk.practicallaw.com/7-573-6346 http://uk.practicallaw.com/7-573-6346