What Is Influencer Marketing?
Influencer marketing involves partnering with content creators - individuals who have built engaged audiences on social platforms - to promote a brand's products. These creators (influencers) produce content featuring the product and share it with their audience, leveraging their established trust and reach to drive brand awareness, consideration, and purchase.
Influencer marketing spans a wide spectrum: mega-influencers (1M+ followers) for broad awareness; macro-influencers (100K–1M) for targeted awareness; micro-influencers (10K–100K) for high engagement and niche audiences; and nano-influencers (1K–10K) for hyper-local or hyper-niche authenticity.
Why Influencer Content Outperforms Brand Content
Influencer content is trusted because it is associated with a personality the audience has chosen to follow. Unlike brand advertising, which audiences are trained to filter out, influencer recommendations carry the implicit endorsement of someone the viewer trusts. This translates into higher engagement rates, higher click-through rates, and - for purchase intent - higher conversion rates than equivalent brand-produced content.
The most effective influencer content feels authentic and natural - the influencer genuinely uses and enjoys the product, and their audience believes it. Overly scripted or transparently paid content loses this trust premium.
Influencer Marketing KPIs
- Reach and impressions (how many unique people saw the content)
- Engagement rate (likes, comments, saves as % of reach)
- Swipe-up/link clicks and attributed traffic
- Attributed revenue (tracked via UTM links, discount codes)
- Cost per engagement and cost per acquired customer
Real-World Example
A sustainable clothing brand identifies 30 micro-influencers in the sustainable fashion niche (15K–80K followers each) and sends them free product for content creation. Each creates 2–3 Instagram posts and Stories featuring the brand. Average engagement rate across posts is 5.2% - three times the brand's own account average. Attributable revenue from discount code tracking is £18,000 over 60 days, at a total product seeding cost of £2,800.