The Anatomy of Buzz/Rosen 44-47

Four Types of Network Hubs1) Regular Hubs--regular folks who serve as information sources2) Mega-Hubs--press, celebrities, analysts, politicians3) Expert Hubs--people who are experts or known for their knowledge4) Social Hubs--people who are in the center of everything due to their charisma, trust, are more socially active.
46 Researchers talk about an individual’s degree of opinion leadership.

47 Opinion leadership may dwindle when the subject is education or dancing troupes.

It’s also important to distinguish between hubs who are listened to because of what they know—expert hubs—and hubs who are listened to because of their social centrality—social hubs.

Expert Hubs: Some people listen to because they have demonstrated significant knowledge of a certain area ( at the very least , they have convinced others of their authority on the subject. Expert hubs tend to specialized.

Social Hubs: In every group there are those who are more central because they are charismatic, are trusted by their peers, or are simply more socially active.