Influencer marketing (also known as influence marketing) is a form of social media marketing involving endorsements and product placement from influencers, people and organizations who have a purported expert level of knowledge or social influence in their field. Influencer content may be framed as testimonial advertising; influencers play the role of a potential buyer, or may be involved as third parties. These third parties can be seen in the supply chain (such as retailers or manufacturers) or as value-added influencers, such as journalists, academics, industry analysts, and professional advisers.^[1]