Online social networks – whether private or business are constantly in the news these days.
So is six degrees of separation – the hypothesis that anyone on Earth can be connected to any other with no more than five intermediaries.
The hypothesis was first proposed in 1929 by the Hungarian writer Karinthy Frigyes in a short story called Chains. The hypothesis is based on the idea that the number of acquaintances grows exponentially with the number of links in the chain, and so only a small number of links is required for the set of acquaintances to become the whole human population.
It gained credence after the 1967 small world experiment by social psychologist Stanley Milgram which suggested that two random US citizens were indeed connected on average by a chain of six acquaintances. Milgram also identified a “funnelling” effect whereby most of the connecting was being done by a very small number of “stars” with significantly higher-than-average connectivity.
Social network theory views social relationships in terms of nodes and ties. Nodes are the individuals within the networks, and ties are the relationships...
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