An influencer is someone who has impact on the decisions of others.
In marketing there are three types of influencers:
Influencer (buying role): a person whose views influence other members of the buying center in making a purchase decision.
Influencer (topical): a person with knowledge and expertise in a particular topic who is sought out for advice and guidance.
Influencer (social media): a person who makes regular posts within social media channels through which they have established a large following of enthusiastic, engaged people who pay close attention to their views.
- Common Language in Marketing Project, 2020.