How to make your mobile app go viral?

Monetizing, Advertising & Marketing Marketing Methods
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I recently researched the topic on app virality for an article (Make Your App Go Viral: Basic Techniques and Helpful Tips), and want to hear more opinions. Maybe you have an example of successful viral strategy? Please share.
What I learned from secondary research and from talking to some developers:

  1. It`s not enough to just add share buttons to your app
  2. You shouldn`t trick user into sharing to social media or inviting friends (lead to very negative brand image)
  3. People love to share, when they provide smth to their friends, like free service or discount.
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Reward (not trick) them for sharing to social media.

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