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Yes— influencer marketing remains an important option in a brand’s marketing mix, but it is not a guaranteed route to sales or a better result than every other channel. Meta-analyses find positive average effects on engagement and purchase intention, while campaign data show results vary by goal, creator, creative, audience, and measurement period. The useful question is not simply whether influencer marketing matters, but which creator and content fit the outcome you need.
Does influencer marketing work?
Evidence indicates that influencer marketing can affect both how audiences engage with content and whether they intend to buy. Those are average findings across studies, not a promise that a particular campaign will perform.
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A 2025 meta-analysis by Pan and coauthors synthesized 1,531 effect sizes from 251 papers. It examined outcomes ranging from attitudes and engagement to purchase intention, purchase behavior, and sales. The review found that different factors matter for different outcomes: follower social identity can shape attitudes and behavioral engagement, post informational and hedonic value can matter for purchase intention, and influencer communication is especially relevant to purchase behavior. The authors also describe mixed findings about follower count and note that product and platform context complicate decisions. Read the review in the Journal of the Academy of Marketing Science.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchA second 2025 meta-analysis compared social media influencers with other endorsement types across 71 papers, 135 experimental studies, and 571 effect sizes. It found positive impacts on engagement and purchase intention, with effects working in part through perceived credibility and attractiveness. Message, product, platform, and follower characteristics also moderated results. Read the meta-analysis.
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What the campaign ROI evidence shows
The Institute of Practitioners in Advertising (IPA) published a database analysis on 8 October 2025 covering 220 campaigns from 144 brands, 36 sectors, and 28 markets, with more than £133 million in influencer spend. That broad database is useful context, but its specific ROI comparisons come from smaller UK campaign samples:
| Measure | IPA finding | How to interpret it |
|---|---|---|
| Short-term ROI index | 99 versus an all-channel average of 100, based on 59 UK campaigns | Near the all-channel benchmark in this sample; not a forecast for an individual brand. |
| Short-term sales contribution | 4.5%, based on the same 59 UK campaigns | A reported contribution measure, distinct from ROI. |
| Long-term ROI index | 151, based on 18 UK campaigns | A stronger result in this smaller, longer-term sample; do not compare it as if it were the same time horizon and sample as the short-term index. |
| Long-term sales contribution | 6.2%, based on 18 UK campaigns | Keep the longer-term period and sample attached to the figure. |
| Long-term multiplier | 3.35, based on 18 UK campaigns | An IPA-reported long-term measure; the database finding is not a universal return multiple. |
The IPA also reports wide variability and says ROI did not strongly correlate with optimization factors such as spend levels. Its findings point instead to the importance of brand–creator fit and creative quality. See the IPA’s database findings.
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How to choose creators for the campaign goal
There is no universally best creator size. In the 2025 Barari, Eisend, and Jain meta-analysis, smaller and medium-sized influencers were more effective at driving engagement, while larger influencers had greater impact on purchase intention. Those results support matching the creator to the objective, not treating a tier as a rule that always wins.
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- For engagement: consider smaller or medium-sized creators, while checking whether their audience and subject matter fit your intended customers.
- For purchase intention: larger creators showed greater impact on average in that meta-analysis, but the product, message, platform, and audience still affect results.
- For sales: define how transactional outcomes will be tracked and avoid treating engagement or purchase intention as proof of purchases.
Follower count alone is a weak selection shortcut. A 2026 Sprout Social report says 17% of surveyed consumers check a creator’s follower count before deciding to engage. That is a survey finding—not a universal measure of what drives campaign performance—and the report covers 2,250 consumers in the US, UK, and Australia. Read Sprout Social’s 2026 report.
How to measure influencer marketing results
- Set the outcome before choosing creators. Decide whether the campaign is intended to generate engagement, purchase intention, or transactional sales. These are different results and should not be substituted for one another.
- Assess audience and creator fit. Check whether the creator’s subject matter and audience align with the people and product involved; do not use follower count as the only criterion.
- Plan the creative. Consider the content’s informational and entertainment value, and whether the creator can communicate the message credibly. The meta-analytic evidence and IPA database both indicate that message or creative characteristics matter.
- Separate short-term from long-term measurement. Report immediate sales or other short-term outcomes separately from longer-term contribution. When using an industry benchmark, preserve its geography, time horizon, and sample size.
- Interpret the result as campaign evidence, not a guarantee. The published averages and IPA database findings help frame decisions, but they do not predict the outcome of a specific brand’s campaign.
Why disclosure and credibility matter
Paid promotion and other material connections should be disclosed clearly. The US Federal Trade Commission (FTC) says a connection that could affect how people evaluate an endorsement should be disclosed. Its Endorsement Guides were revised in June 2023 and apply across media; they are guidance, while the FTC may investigate conduct it considers unfair or deceptive under the FTC Act. Requirements differ by jurisdiction, so brands and creators should also check the rules that apply where their content appears.
The FTC’s 2019 Disclosures 101 for Social Media Influencers identifies financial, employment, personal, and family relationships—and free or discounted products—as possible material connections. It advises placing a clear disclosure with the endorsement, in language the audience can understand. A disclosure hidden on a profile page, behind a “more” control, at the end, or among hashtags may not be sufficient; the guide also says video endorsements should disclose in the video, and live-stream disclosures should recur. The FTC’s June 2023 update announcement discusses clear and conspicuous disclosures, platform disclosure tools, fake reviews, and potential responsibility for advertisers and endorsers. Consult the FTC’s current endorsement guidance and its Disclosure 101 guide.
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Disclosure is not only a compliance task: an endorsement should reflect the creator’s real experience. Do not make or imply claims about using a product when the endorser has not used it. The FTC puts responsibility on influencers to make disclosures and comply with laws against deceptive advertising, rather than relying on others to do it for them. For the FTC’s update context, see its June 2023 announcement.
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