An influencer is someone who is able to persuade a lot of other people, for example their followers on social media, to do, buy, or use the same things that they do. They are often paid or given free productsin exchange for doing this.
They invited a lot of minor celebrities and Instagram influencers to the launch party.
influencer in British English
(ˈɪnflʊənsə)
noun
1.
a person who uses social media to promote lifestyle choices, commercial products, etc to his or her followers