B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
15%
15% -- purchase likelihood lift for verified buyer reviews (2026)
Displaying 'verified buyer' badges increased purchase likelihood by 15% compared to anonymous reviews.
- Compared against anonymous reviews
Attribution:
View source
Lighthouse Research Team
Last verified:
·
How we verify data →
Source verified
Evidence graded
Value
15%
Unit
Percentage
Data Vintage
2026
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Spiegel Research Center
Primary
Tier C
https://kirro.io/social-proof-examples ↗
Source Article
15 Social Proof Examples That Actually Convert (2026)
Social proof is people copying other people. That’s it. You check restaurant reviews before booking. You read testimonials before buying software. You pick the busier coffee shop over the empty one. All social proof. And it works: products with just five reviews sell 270% better than products with z…
Original Research
Spiegel Research Center
· Original study ↗
Methodology
Spiegel Research Center research, cited by kirro.io
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
verified buyer reviews: 15% purchase likelihood lift. Source: Spiegel Research Center (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/verified-buyer-badge-15-percent-lift
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<blockquote cite="https://lighthousedata.io/data/verified-buyer-badge-15-percent-lift" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>15%</strong> -- purchase likelihood lift for verified buyer reviews<br><small>Source: Spiegel Research Center (2026) · <a href="https://lighthousedata.io/data/verified-buyer-badge-15-percent-lift" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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