Social Proof : Testimonials, Case Studies or Videos. In this video Sales Training expert and keynote speaker Victor Antonio talks about the different types of social proofs or persuasion tools you can use to convince a client. People are more convinced when the see other testimonials from other clients, especially those that are similar to their own needs or industry and are recorded on video. In this video, Victor Antonio discusses the advantages and disadvantages of all three types of social proof. You can find more Sales Influence moments at www.VictorAntonio.com or www.SalesInfluence.TV