Grumpy Old Geeks Topics Social proof in advertising Topic Social proof in advertising 2 mentions in 1 episode The hosts discuss why a recommendation from a friend can attract attention to a product. Mentions 1: How to make money on the Internet. Sorta. Mar 25, 2013 25:48 when my friends repost something or talk about a product, that's when I pay attention 27:01 you are apt to listen to something that somebody else recommends