Apparently Paolo and I just started writing a book

Apparently Paolo and I just started writing a book, about trust metrics, of course. Feel free to write along ;) It made me think about an article I read about the advantages of hitchhiking to society. Unfortunately I don't remember much more than some vagueness. I'm not giving up yet, though. I think it was about how random people meeting and sharing - which is what hitchhiking basically is about - will have a very positive effect on society, i.e. increasing the trust of people in other people. May the PageRank be with me on this quest.