RT Book, Whole DB /z-wcorg/ DS http://worldcat.org ID 818461733 LA English T1 Contagious A1 Berger, Jonah., PB Simon & Schuster PP London YR 2013 SN 9781471111693 1471111695 AB Why are some products and ideas talked about more than others? Why do some articles make the most emailed list? Why do some YouTube videos go viral? Word-of-mouth. Whether through face-to-face conversations, emails from friends, or online product reviews, the information and opinions we get from others have a strong impact on our own behaviour. Indeed, word-of-mouth generates more than two times the sales of paid advertising and is the primary factor behind 20-50% of all purchasing decisions. It is between 8.5 and 30 times more effective than traditional media. But want to know the best thing about word-of-mouth? It's available to everyone.