01 What it is
A collection of responses suggests many people share the same worry or goal. Seeing others mention it makes the worry feel more common, and the ad creates a sense of community around the problem.
It can be quieter than a review count. A question and an answer in the same ad imply two voices: someone asking, and someone who has found a product they use. That small exchange can feel more social than a standard product claim.
Proof is only as good as its source. A number from a survey of existing customers is a different kind of claim from a study of people in general.
02 How to spot it
Other people’s voices inside the ad: replies, ratings, a count, a friend recommending it.