Social Proof
The tendency to look at what other people do or endorse when deciding how to act, used in interfaces through reviews, ratings and usage signals.
Buyers rely on other people's experience when stakes are high, so credible reviews, client logos and case studies near a decision point can lift conversion and shorten B2B evaluation, while weak or fake signals damage trust.
A SaaS pricing page adds a 4.6 average rating from 320 verified reviews, three customer logos from the target industry and a short case study, then runs an A/B test for four weeks to measure the effect on demo requests.
Small numbers can backfire by signaling that few people care. Fabricated or undisclosed incentivized reviews breach consumer protection rules in many markets, and live notification widgets add clutter and page weight, especially on mobile.
Robert Cialdini described social proof as one of six principles of influence. In interfaces it appears as reviews and ratings, behavioral signals such as items other viewers also looked at, endorsement counts, testimonials and User-Generated Content (UGC). Its effect depends on how similar the viewer is to the people shown, the volume of visible engagement and perceived authenticity. Conversion Design teams test placement and format with A/B tests, usability tests and page speed checks.
Performance Advertising, Revenue Operations
Nielsen Norman Group — Social Proof in the User Experience — https://www.nngroup.com/articles/social-proof-ux/; Interaction Design Foundation — What is Social Proof? — https://ixdf.org/literature/topics/social-proof