Coca-Cola (KO -1.09%) has come out and said that a recent study it conducted found that advertising via "buzz" -- i.e., sharing through social media such as Facebook (META -1.70%) or Twitter -- had no measurable impact on sales for the company. Is this a major problem for Facebook's business model? In the following video, Motley Fool consumer-goods analyst Blake Bos tells investors why they shouldn't put a lot of stock in this study. He shows us what the biggest problems with the study were, and why companies still have a lot of value to unlock through social-media advertising.