Why We Crave Third-Party Voices
In an age where ads are everywhere and attention spans are shrinking, brands face a growing credibility gap. Consumers often dismiss brand claims, hyperbole, and promotional speak. But when someone else, a trusted external voice, vouches for your product or message, it cuts through the noise. That’s borrowed trust.
Psychological and marketing research consistently show that endorsements from celebrities, influencers, or peers can drive higher trust, better recall, and stronger purchase intention than ads that talk only about the brand’s features. To see how powerful endorsements are, let’s dive into what the evidence says.
What the Research
Tells Us
Here are a few key studies that shed light on how and why endorsements tend to outperform standard ads:
Human vs Virtual Endorsements: Emotion Matters
A 2025 study by Yixuan Liu and Ke Lei compared human endorsements to virtual endorsements (think real people vs digital avatars) under emotional vs rational advertising appeals.
- When the ad appeals were emotional, human endorsers significantly outperformed virtual ones in building trust and driving ad efficacy.
- When appeals were more rational or logical, virtual endorsers could sometimes match or even outperform human ones. But even then, trust played a big mediating role.
This shows that the context of a message matters: what the ad is trying to evoke (emotion vs logic) should influence the kind of endorser used.
Authenticity & Product Fit
A study from the University of Florida (2024) found that virtual influencers are consistently perceived as less authentic than human influencers across all product types. This lower perceived authenticity leads to weaker purchase intentions and brand attitudes.
That said, authenticity isn’t the only factor. The study found that product-endorser fit also matters. If a virtual influencer is promoting a product where innovation or novelty is welcome (or where people expect less human touch), the gap between human vs virtual endorsers narrows. But for symbolic, emotional, or identity-related products, human endorsers usually win.
Celebrity Endorsement &
Purchase Intentions
Multiple studies in different markets and product categories confirm that celebrity endorsements strongly influence purchase intention—especially when the celebrity is seen as credible, trustworthy, and well-matched to the product.
- For emerging luxury brands, a 2022 study in Egypt of 145 respondents showed that celebrity endorsement significantly boosts purchase intention. The most impactful dimensions were trustworthiness, physical attractiveness, and product-celebrity match-up.
- Another investigation (2019, Ghana) with 500 participants found that celebrity attributes like attractiveness, trustworthiness, and familiarity impact not only purchase intention but also perceived quality and brand loyalty.
Parasocial Relationships & Influencer Power
Beyond celebrities, social media influencers build what psychologists call parasocial relationships, one-sided but emotionally felt relationships, where followers feel a kind of closeness, familiarity, or trust with the persona. This makes celebrity and influencer endorsements disproportionately strong in driving purchases, especially among younger audiences. An in-depth analysis of over 200 fashion and beauty influencers and 7,000 social posts in Japan found that these parasocial interactions led to an increase in the parasocial relationship and trust between followers and influencer, which allowed for more influence on followers’ purchase intentions.
What This Means in Practice: How to Use Endorsements Effectively
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Pick the Right Kind of Endorser for your Message
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- If you’re leaning into emotion with a focus on storytelling, identity, and values, then use human endorsers who evoke empathy, authenticity, and relatability.
- If the message is technical, rational, or functional (highlighting features, performance statistics, comparisons), social influencers or expert endorsers may suffice or be more efficient, IF they are credible.
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Ensure the Product(s) and Brand Match-Up
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- Match-up means the endorser aligns with the product in identity, values, and image. If there’s a dissonance (a luxury brand endorsed by someone seen as mass-market, or a functional product with an influencer known for style only), then the endorsement may do more harm than good.
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Prioritize Trust and Perceived Authenticity
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- Research repeatedly shows that trustworthiness and authenticity are decisive. If the audience perceives the endorser as “selling only,” or if there’s misalignment, false advertising, or over-promotion, the effect of the message weakens sharply.
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Leverage Parasocial Relationships and Social Proof
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- Influencers who share parts of their life, who reveal their personality, and who interact with followers build intimacy and trust. Social cues (how many people follow, comment, and engage) also reinforce that “others trust them, so I should.”
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Test and measure customer sentiment and longer-term metrics.
Success here isn’t just immediate clicks. It’s good practice to measure the following:
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- Change in brand trust
- Ad recall & message retention
- Purchase intention (especially for new customers)
- Brand loyalty
- Repeat purchases over time
Common Pitfalls to Avoid
- Choosing an endorser just for visibility or reach instead of credibility or fit.
- Overusing endorsements to the point that they feel generic or over-exposed.
- Neglecting transparency. If followers feel there’s deception or that an endorser isn’t honest about their relationship with the brand, backlash follows.
- Focusing only on short-term uplift, like click-through rate, while ignoring brand equity, loyalty, or long-term attitude shifts.
Case Snapshot
- Here’s a mini example (hypothetical, but anchored in evidence):
- A functional skin care brand wants to promote its new formula. If the messaging is “clinically supported, dermatologically tested,” a social media influencer or expert in the field might do well. But, if the brand wants to connect emotionally—“your skin, your story, your confidence”—then a relatable endorser who shares life stories or struggles will likely move the needle more.
- Suppose Brand X uses a celebrity endorsement for a luxury fragrance. If the celebrity is admired, trustworthy, and aligns with the brand’s image, research suggests higher purchase intent and stronger brand loyalty (as seen in this study conducted in Egypt on celebrity endorsements and their impact on purchase intention for luxury brands).
Conclusion: Why Borrowed Trust Might Be Your Fastest Route to Belief
Advertising isn’t just about making claims. It’s about credibility, identity, and resonance. When your brand borrows trust through properly matched, authentic endorsers, it unlocks psychological shortcuts that foster faster belief and less skepticism with a higher willingness to buy.
While endorsements aren’t free (financially or reputationally), when they’re done the right way, they can outperform standard ad-driven claims, especially when the endorser’s message type, identity, and authenticity align with the audience’s values.
At Happy Hour Media, we’ve made it simple to fit the right personality with your brand that will resonate most with your target audience. Our proprietary Endorsement Engine™ combines human insight with AI precision to identify the right voice for you based on four dimensions:
- Audience Alignment
- Trust Equity
- Voice Fit
- Exclusivity Leverage
Find your brand’s match here!