[sutro]

Old-school, low-tech, real-time, in-person approach: "Hi. How's it going?"

Your TinEye approach, later that day, via email: "Hi. How's it going? You don't know me, but I surreptitiously took your photo in the park earlier today, uploaded it to a reverse image search engine, and eventually uncovered your personal data after an exhaustive web search. Care to get some coffee sometime?"

Why don't you A/B test these two approaches to find out which works best?

[cousin_it]

Why "later that day", don't you have internet access from the phone? :-) I agree the old skool approach would work better for me, but the high-tech one is still a boon for stalkers and such.