“Apparently, if you look at how many numbers we're likely to store in our mobile phone, or how many names we're likely to list on a social networking site, it's rare even for city dwellers to exceed a couple of hundred. Social anthropologists delightedly point out that this is the size of the social group we would have had to handle in a large Stone Age village. According to them, we're all trying to cope with modern big-city life equipped only with a Stone Age social brain. We all struggle with anonymity.”