The idea that any two people on Earth are separated by only a few social connections is known as the "six degrees of separation" theory. This concept, deeply rooted in popular culture, has a solid scientific foundation and a long history of research. Its foundation was laid not by sociologists, but by the Hungarian writer Frigyes Karinthy, who in his 1929 story "The Links of the Chain" proposed that any two people on the planet are connected by a chain of no more than five intermediaries. This artistic hypothesis later inspired scientists to conduct large-scale experiments.

Stanley Milgram's Experiment: A Small World in Envelopes

In 1967, the first empirical test of the theory was conducted by the American psychologist Stanley Milgram. In his famous experiment, residents of the American city of Omaha were randomly sent letters asking them to forward them to a specific stockbroker in Boston. The sender could only pass the envelope through their personal acquaintances, whom they believed to be "closer" to the target. Only a small number of letters reached the final addressee, but the key result was the average number of transfers — it was about five to six. This experience gave rise to the now-famous phrase "six degrees of separation," although Milgram's methodology has been criticized repeatedly for potential statistical errors and lack of representativeness.

The Evolution of the Theory in the Digital Age

With the advent of the internet and social networks, scientists had an unprecedented opportunity to test the hypothesis on vast amounts of real data. Researchers from Microsoft in 2008, analyzing more than 250 billion instant messages sent between 240 million users, found that the average distance between any two users of their service was 6.6 steps. A similar study conducted on Facebook data showed even closer connections: in 2016, the average distance between users was only 3.57 steps. These numbers demonstrate that digital platforms, acting as a global social catalyst, did not confirm but rather refuted the classic theory, showing that the world has become "smaller" than expected.

Criticism and Limitations of the Hypothesis of Global Connectedness

Despite convincing evidence, the "six degrees of separation" theory faces serious criticism. The main limitation lies in the fact that it measures the possibility of establishing a connection, rather than its probability or quality. Social networks are heterogeneous: they consist of tight clusters (families, work collectives), connected by weak but numerous connections between acquaintances. It is these "weak ties," as shown by sociologist Mark Granovetter, that often serve as bridges between isolated communities. However, there are also truly isolated groups — tribes in the Amazon rainforest or residents of remote Arctic settlements, whose inclusion in the global network requires a much greater number of intermediate links, if it is even possible.

Philosophical and Cultural Resonance of the Concept

The philosophical significance of the theory extends far beyond sociology. It offers a powerful metaphor for the unity of humanity, visualizing the invisible web that connects all people, regardless of their culture, nationality, or social status. This idea has inspired the creation of numerous works of art, the most famous of which is John Guare's play "Six Degrees of Separation" and the film of the same name. The concept also lies at the foundation of the popular game "Six Degrees of Separation to Kevin Bacon," where players must connect any Hollywood actor with Bacon through common movies. Thus, from a scientific hypothesis, the theory has become a cultural phenomenon, highlighting the fundamental interconnectedness of the modern world.

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