The Exchange and the Network.
Telegraph exchanges provided a conceptual model when telephones sprang to public attention. They were rapidly introduced for use within the domestic and economic spheres; the telephone network, from its early days, served both. . .It was the exchange principle that led to the growth of endless new social organizations, because it offered choice of social contacts, on demand, even between strangers, without ceremony, introduction, or credentials, in ways totally new in history. The exchange principle led rapidly to the creation of networks, covering whole countries and, since World War II, interconnecting the continents, (pp.114-115).
