They are interested in the fact that, despite the fleeting nature of many of our relationships, we often form cliques - circles of friends that are often friendly with each other. This could help us to understand why our society is made up of so many groups, from political to sporting. The study looks at how we often form friendships with people who are similar with us in some way. This could mean having a similar profession, interest, hobby, religion or political affiliation.
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