Collaborations among humans
There is a series of interesting articles in The Economist on human evolution. The most interesting point was the observation that human brains are hardwired to detect injustice. This means that even our ancestors could distinguish between friends and foes based on previous actions done by their counterparts. A good deed was returned by a good deed, but selfishness was not favored. Such trust based relationships are not seen in other species at all. In fact, some scientists are of the opinion that the reason for the larger size of the human brain is to enable this collaborative function among humans because it requires more brain processing. So much so, there is a high correlation between the brain:body ratio and the size of the group that a species lives in. For humans, this mean size is around 150, which was also the typical size of a primitive hunter-gatherer group. The rise of a collaborative society based on trust relationships acquired over time, is also considered responsible for the development of language, and consequently, for the use of language for manipulations and politics. All in all, there seems to be a high value in detecting levels of trust and reputations among humans for any kind of communication activities.