In truth, it was an old--even hoary--marketing concept, dating back to 1955, when the pioneering sociologists Elihu Katz and Paul Lazarsfeld wrote Personal Influence. They had argued that advertising affected society through a two-step process: Companies broadcast messages, which were then seized upon by "opinion leaders" who proselytized their peers. They weren't talking about celebrities like Oprah or even Paris Hilton, but about the rare everyday people who catalyze trends. Reach those opinion leaders, Katz and Lazarsfeld argued, and you'd quickly convert the masses.
Gladwell reanimated this concept in The Tipping Point. To help illustrate the cultural sway of his hypernetworked protagonists, he tapped the renowned 1967 "Six Degrees of Separation" study by sociologist Stanley Milgram. In that experiment, Milgram had given letters to 160 people in Nebraska, with instructions to ferry them to a particular stockbroker in Boston by passing the letters along to a colleague socially closer to the target.
Twitter untersuchen, inwiefern z.B. Gruber o.a. als Opinion Leaders gelten können...