Having talked in
The Branded Mind about how how people fall in love, and how this has something to do with selecting the genes of your partner, here is a study about who you become friends with.
Best friends forever: It's all in our genes, say scientists
Read more:
http://www.dailymail.co.uk/sciencetech/article-1348051/Best-friends-forever-gene-Its-DNA-say-scientists.html#ixzz1BTuO6mE1
Not surprisingly I will tag this page not only under 'culture' but also under 'personality'.
What is important for the theses that I have raised is that there are biological reasons why one should be doing multi-dimensional segmentation studies.