Technique · Influence

Proof from similar others

Choose testimonials, case studies and usage data by the visitor's industry, role, size, country, language or experience level, and let users filter reviews by "people like me". People follow those who resemble them far more than generic crowds.

DiscoverPay

Plain label: people like youAlso known as: similar-other proof, peer proof, segment testimonials, local norm, people like you also chose

How it works

Similarity is the second condition that powers social proof: we take our cue from people we see as like ourselves. The closer the reference group (same role, same company size, same neighborhood), the stronger the pull. Fabricated matching, such as personas that claim a background they do not have, collapses trust once detected.

In the book. Similarity is the second condition for social proof: people follow others like themselves (Ch.4, pp.107-109). INF-T-SP-17 (Influence Ch.4, p.107)

In a product [S]. Proof chosen by segment, and review filters for people like me.

Evidence Evidence grade B. Moderate evidence: solid studies with some limits.. Field experiments with close reference groups show durable effects.

Evidence warning

Book numbers come from older single studies; test matched vs generic proof locally.

What the research says

People who found a lost wallet with a letter from an earlier finder returned it 70% of the time when that finder seemed similar to them, and 33% of the time when the finder seemed dissimilar.
Influence Ch.4, pp.107-108 (Hornstein et al.), 1968
Home energy reports comparing a household with similar neighbors cut energy use by about 2% on average across roughly 588,000 households, and the effect persisted.
Allcott & Rogers, American Economic Review, 2014
In the hotel towel study, a norm about guests who had stayed in the same room outperformed a norm about guests in general.
Goldstein, Cialdini & Griskevicius, Journal of Consumer Research, 2008

Before you start

Enough real customers per segment to show matched proof

How to build it

Web: Show logos and quotes from the visitor's industry (from the referring page, campaign tag or a one-click selector) instead of one generic logo wall.
E-commerce: Let shoppers filter reviews by attributes such as skin type, size or experience level, and show matching reviews first.
B2B: Lead the proposal with two customers of the same size and industry and offer a reference call with one of them.
Mobile: In onboarding, show what people with the same goal did in their first week.

What can go wrong

Claiming a similarity that is not real.
Segments with a single story, which reads as cherry-picked.
Matching so narrow that it hides useful general proof.

Pairs well with

Pairs with in-t-sp-12: matched proof at the point of doubt.
Pairs with in-t-sp-19 for onboarding.

In practice

Where it shows up

Airbnb · 2017
Round
Airbnb: reputation beats similarity
In an experiment with 8,906 Airbnb users, high reputation significantly increased trust between dissimilar users, offsetting the pull toward similar others; analyses of about 1M real Airbnb interactions agreed (Abrahao et al., PNAS, Sept 2017).
M3 ×DiscoverStay
Case grade for the number: A. Evidence grade for the mechanism link: A.
Duolingo · 2023
Round
Duolingo: weekly leagues
Leaderboards raised overall learning time 17% and tripled highly engaged learners (1h+ a day, 5 days a week), per Duolingo's Jorge Mazal (Feb 2023). Company-reported, and part of a broader retention push that grew DAU 4.5x over four years.
M4 ×Return
Case grade for the number: B. Evidence grade for the mechanism link: B.CorrelationalMany causes
Hotel field experiment (Goldstein, Cialdini & Griskevicius) · 2008
Round
The hotel towel study: “guests in this room”
Experiment 1: 44.1% towel reuse with the descriptive norm vs 35.1% with the environmental appeal. Experiment 2: the same-room norm reached 49.3% vs 42.8% for the other norm messages combined, and the standard message 37.2%. Peer-reviewed field experiments.
Start
Case grade for the number: A. Evidence grade for the mechanism link: A.
Opower · 2014
Round
Opower: your energy use vs your neighbors'
Average energy reduction of about 2.0% (1.4-3.3% across 12 utilities) in a randomized evaluation of 588,446 households; homes dropped after about two years still saved about 2% (Allcott & Rogers, American Economic Review, Oct 2014; via J-PAL). Oracle bought Opower in 2016 (~$532M).
M3 ×Stay
Case grade for the number: A. Evidence grade for the mechanism link: A.

Limits

What we don’t claim

Left Brain and Right Brain are a metaphor for extrinsic and intrinsic motivation, not a claim about neuroscience.Actionable Gamification Ch.13, pp.342-343

Keep reading

TechniqueEvidence grade C. Limited evidence: few or small studies.
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cheaper, safer first step
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Verifiable, relevant credentials
checkable expertise that fits the claim
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Accurate logos, press and awards
checkable prestige signals
Use prestige signals only when they are accurate and checkable: customer logos used with permission, press mentions linked to the article, awards with the issuer and year. Trappings earn deference quickly, which is exactly why buyers discount them once one turns out to be borrowed.
TechniqueEvidence grade B. Moderate evidence: solid studies with some limits.
Admit a minor, real limitation
say what the product is not good for
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Endpoint first: full price and terms at step one
all-in price shown first
Show what the user is signing up for before the first step: the total price with mandatory fees, the renewal terms, the time involved and the data requested. The first price shown should be the final price. This removes the lowball gap and the refunds that come with it.
TechniqueEvidence grade B. Moderate evidence: solid studies with some limits.
Accurate popularity cues
true "most popular" labels and usage counts
Show popularity only as it really is: "Most popular" on the plan most chosen, a defined count of active teams, "copied 3,400 times" on a template. People treat what many others do as a sign of what is right, so a true count helps the uncertain; an inflated one invites distrust once noticed.

Sources

Influence · Robert Cialdini
Ch.4, p.107
The short-run and long-run effects of behavioral interventions: experimental evidence from energy conservation · American Economic Review, 2014
Evidence grade A. Robust evidence: replicated, peer-reviewed research.
A room with a viewpoint: using social norms to motivate environmental conservation in hotels · Journal of Consumer Research, 2008
Evidence grade B. Moderate evidence: solid studies with some limits.

Source IDs: INF-T-SP-17

Book content is paraphrased, never quoted at length. Last verified October 24, 2026.

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