Graphs and NetworksSocial

In 1929, when the Hungarian author Frigyes Karinthy

Frigyes Karinthy (1887 – 1938) was a Hungarian author, poet and journalist. He is best known for the 1929 short story “Chains”, which first introduced the concept of six degrees of separation.

first proposed the idea of “six degrees of Separation”, there was no Internet or social media, but the world had already started to become more interconnected.

In 1967, Stanley Milgram

Stanley Milgram (1933 – 1984) was a famous social psychologist. He is best known for experiments on obedience, testing how willing adults are to follow orders, even when hurting others, and for the small-world experiment, which tests the degree of connectedness of societies.

conducted a first empirical experiment, where 296 participants living in Nebraska and Kansas were asked to deliver a letter to a particular person living in Boston, Massachusetts. They all had to choose a friend to send the letter to, who then picked another friend. At every step, the letter moved closer to Boston. Milgram found that there were, on average, only 5.2 intermediate friends – 5.2 degrees of separation.

Today, every one of us is part of countless invisible graphs, which underlie our social interactions, travel, Internet and technology, science, and so much more.

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