What is Social Proof?
Social proof definition: social proof is a psychological concept that suggests people will “follow the lead” of others when trying to decide a course of action.
Social proof is an important part of marketing as it can help to influence consumer’s decision making by providing them with “evidence” of other people using a product or service.
This evidence can be presented in a number of different ways, including:
- Brand advocacy
- Testimonials
- Celebrity endorsements
- Expert endorsements
- Influencer posts
- Customer (or company) milestones
- Word-of-mouth marketing
Social proof was first outlined in Robert Cialdini’s book Influence.

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Additional resources about Social Proof
- How To Use the Psychology Of Social Proof To Your Advantage
- Social Proof: What It Is, Why It Works and How to Use It
- Social Proof: Your Key to More Magnetic Marketing
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