These friend-of-a-friend links also appear to be important in the animal world, such as to the survival of monkeys 

‘Friends of friends’ relationships may be simpler than they seem

New research gives clues into how social networks can evolve by showing that complex social patterns seen in the animal kingdom may be simpler than they appear.

Not only are friends an important part of our lives, but so are friends of friends, according to a study by the University of Exeter and the University of Oxford. 

These “friend-of-a-friend” relationships are known as “indirect social connections”, and show where each individual is positioned within a social network.

Previous studies have suggested that people can track the social network positions of others, and that indirect social connections may influence our health, wealth and survival.

These friend-of-a-friend links also appear to be important in the animal world, such as to the survival of dolphins in their early years of life, or the reproductive success of birds, monkeys and apes.

Such findings have been cited as evidence of individuals’ ability to assess the social connections of others and base their own behaviour on this.

However, the new study, published in Proceedings of the Royal Society B, demonstrates that very simple mechanisms can underpin these relatively complicated social dynamics.

Computer simulations were used to create social networks from virtual individuals that only differed according to a single simple behaviour, such as their preferred group size or how often they interacted with their group members.

The results showed that these simple tendencies created complex societies and determined the number and type of individuals’ friends-of-friends, even more so than they determined individuals’ own friends.

This suggests that certain findings regarding the wider social network positions of humans and other animals may not require any form of complex social behaviour or intelligence.

Lead author Dr Josh Firth, from the University of Oxford, said: “Indirect social connections have been shown to be related to individuals’ genetics, traits, and different aspects of their lives, so it was interesting to see how such findings can actually arise within very simple social systems in which no complex strategies are in play.”

The study may also help explain how complex social structures can evolve by allowing natural selection to act on individuals’ indirect social connections.

Dr Firth added: “I’m often asked how an animal’s own genetics could possibly determine the social connections of its associates and how these aspects of individuals’ social behaviour could ever be subject to natural selection.

“This research provides an intuitive explanation for this. If an individual’s friends-of-friends connections are actually underpinned by a simple behaviour, then it may be this behaviour that is governed by their genetics. In this way, evolutionary forces could act on complex social network positions in a fairly straightforward manner.”

Date: 15 November 2017

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