Step 4: Locate those potential influencers who have interests relevant to the campaign. To find potential influencers for a particular social media campaign, it is not enough to identify social media users with influence; instead, a company needs to identify those influential social media users who are particularly interested in the company’s category of goods and services. To do this, we developed a metric we call the Stickiness Index (SI), which measures the degree of WOM generated by a particular user on a given topic — essentially, how much of a user’s discussions via social media are about a particular topic. This metric can help businesses locate the individuals who not only have influence but also like to talk about a particular product category. (See “Calculating the Effect and Value of Social Media Influence.”)