Discussion
Which of the following is the characteristic which is not exhibited by social network ?
Answer: C
The characteristic not exhibited is Widening diameter.
Studies of real social and information networks, notably by Leskovec, Kleinberg and Faloutsos, found three regularities. Degree distributions are heavy-tailed, with a few nodes having very many connections. Networks densify over time, the number of edges growing faster than the number of nodes according to a power law. And the effective diameter shrinks as the network grows.
So social networks show shrinking, not widening, diameters, contrary to what earlier models predicted. Since one listed characteristic is not exhibited, 'None of the above' is wrong.
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