If your referral program isn’t public facing or it’s difficult to use and share with the click of a button, then you’ll severely limit your ability to drive word-of-mouth and referrals. Also, if you’re requiring customers to manually input a potential referral’s information, good luck. For customers, this annoyance creates a barrier that significantly hinders referral activity.
According to a paper by Duncan Watts and colleagues entitled: "Everyone's an influencer", 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.