Contagious: Why Things Catch On (Jonah Berger, 2013)


  • Word of mouth is more persuasive and more targeted
  • Example: Blendtec Youtube video - Will it blend?
  • 6 key STEPPS:
  • Social currency: how people sees a product
    • Foursquare don’t pay users to check in and airlines don’t give discounts to frequent flier members
  • Triggers: how one thing related to another
    • Give me a break, give me Kit Kat
    • Poison parasite slyly injects poisons (your message) into rival’s message using trigger
  • Emotion: how people feel about something
    • Like social glue, maintaining and strengthening relationships
    • Positive, high arousal: awe, excitement, amusement (humor)
    • Positive, low arousal: contentment
    • Negative, high arousal: anger, anxiety
    • Negative, low arousal: sadness
    • Example: United breaks Guitars
  • Public: monkey see monkey do
    • Social proof: tip jar always have money
    • Example: Sent by Blackberry or iPhone
  • Practical value: useful content
    • Life Hacks in YouTube
    • The rule of 100 where big amount should use value and small amount to use percentage
  • Stories: epic story shares more value
    • Share story using Trojan horse method

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