In his famous book 'Influence', Robert Cialdini describes 6 principles of influence, which work both offline and online. These principles are
6 Principles of Persuasion - Robert Cialdini - download link | Picture It
Cialdini's 6 Principles of Persuasion
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A quick look into the six principles of influence
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Unity: Robert Cialdini's New 7th Principle of Influence, by Roger Dooley, Psychology of Stuff
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