The top comment there[1] describe use of ad in such a wholesome way that I almost cried. Don't even know why it effected me so much. Is this what facebook ads should have been? People advertising to each other rather than companies advertising to people? Another question which poped in my head is would this lead to more or less data gathering? To target in such a hyper localized way can either be done with a lot of info or in a less intrusive way by just looking at the buyer's social graph.

[1]https://news.ycombinator.com/item?id=4408747