Social proof
In one sentence
Social proof is the conversion lift a shopper takes from seeing other people validate a product. Reviews, photos, videos, "X people just bought this" and "Y customers rated this 4.7" are all social-proof formats.
In more detail
The mechanism is Cialdini-classic and the magnitude on ecommerce PDPs is well-instrumented. PDPs with reviews see roughly 354% higher conversion than PDPs without (Bazaarvoice 2025 SEI). UGC photos amplify the effect by adding contextual demonstration on top of the trust signal.
Read more on this
Strategy
The Psychology Behind Social Proof: Why Customers Trust UGC More Than Ads
92% of consumers trust a peer recommendation over brand advertising. Understanding the why, not just the stat, is what changes how you build a product page.
Strategy
What Is User-Generated Content (UGC) in Ecommerce?
UGC in ecommerce is any photo, video, review or post about a product made by a customer rather than the brand. How to collect, clear and measure it.
External reference
en.wikipedia.orgSee it working on a live store.
Real storefronts using the thing this page defines.
