When you're thinking about viral marketing for your business, you want to consider offering discounts and decide if it's beneficial or not. Jonah Berger suggests using the $100 rule - under $100, and a 25% discount seems like more than the same dollar amount off. Over $100, and the dollar amount seems like a better deal even though it's the same as the percentage.
According to a paper by Duncan Watts and colleagues entitled: "Everyone's an influencer",[66] the most common risk in viral marketing is that of the influencer not passing on the message, which can lead to the failure of the viral marketing campaign. A second risk is that the influencer modifies the content of the message. A third risk is that influencers pass on the wrong message. This can result from a misunderstanding or as a deliberate move.