What is social proof?

Social proof is a psychological and marketing principle where people use the actions, opinions, or experiences of others to help decide whether they should trust a brand, product, or service.

In CRO, social proof helps reduce uncertainty and build confidence, encouraging visitors to take actions such as purchasing, signing up, or submitting a form.

Common types of social proof:

1. Customer reviews and ratings – Show feedback from real customers.
2. Testimonials – Highlight positive customer experiences.
3. User-generated content (UGC) – Display customer photos, videos, or social posts.
4. Sales or popularity indicators – Examples include “1,000+ customers” or “Best seller.”
5. Case studies – Demonstrate results achieved by existing customers.
6. Influencer or expert endorsements – Recommendations from relevant and credible people.
7. Client or brand logos – Show recognizable businesses that use the product or service.
8. Awards and certifications – Demonstrate recognition or credibility.
9. Media mentions – Show legitimate publications or platforms that have featured the brand.
10. Referral or community signals – Show recommendations or participation from an established customer community.

Example

An ecommerce product page might display:

★★★★★ 4.8/5 from 2,500+ verified reviews

This provides evidence that many other customers have purchased and positively evaluated the product.

In simple terms: Social proof shows visitors that other people trust, use, recommend, or value a product or brand, helping reduce hesitation and improve conversions.