Finding the Invisible Leader: When A Priori Opinion Leader Identification is Impossible.

Opinion leaders are increasingly recruited to diffuse information, attitudes, and behaviors to serve communication campaigns. However, this has historically required opinion leader identification before launching the campaign. A priori identification is impossible in many contexts, such as when addressing unfamiliar topics or insular communities. The authors introduce a two-stage campaign approach that resolves this problem, and a public health campaign is used to demonstrate it. This approach is applicable to a wider variety of contexts than traditional a priori opinion leader identification.