Social proof

Evidence that other people vouch for you — reviews, testimonials, references, peer word-of-mouth. It outranks anything you say about yourself because it appears independent: 87% of tech buyers call credible, non-biased sources essential for shortlisting, while the vendor’s own marketing collateral ranked last among consulted resources (TrustRadius).

Source: Robert Cialdini, Influence: The Psychology of Persuasion (1984). Cialdini’s principle: when people are uncertain, they look to what similar others have done — which is why logos, reviews, and testimonials de-risk a $50k decision.

First used in: 1.5 · The proof stack