The current study identified research trends and theory regarding social media influencers. By searching journals related to social media influencers in the Social Sciences Citation Index and Sciences Citation Index Expanded database in the 20-year period between January 2000 and December 2019, we collected 237 research articles pertaining to social media influencers. From an analysis of these articles, we mapped research trends and identified highly influential articles. The theories used in social media influencer research were also identified. The results provide fundamental insights into research on social media influencers.