Trust is the foundation of conversions and sales. But building trust should be a goal on its own. The whole concept of content marketing is based on trust and creating long-term relationships. Stop selling and let the people come to you by providing them interesting and useful information. I couldn’t have said it better than Mark Schaefer, the Executive Director of Schaefer Marketing Solutions:
Single or Double-sided Rewards – A common practice in referral programs is to only give out a reward to the sender of the referral. We believe that this is not the right way to approach referral marketing. If you don’t reward both parties you are changing the overall motivation a user has to make a referral to their network. Double-sided programs give rewards to both the sender and the recipient. The even reward structure helps motivate users who are not looking to profit off of their personal network.
According to Statistica, 76% of the U.S. population has at least one social networking profile and by 2020 the number of worldwide users of social media is expected to reach 2.95 billion (650 million of these from China alone). Of the social media platforms, Facebook is by far the most dominant - as of the end of the second quarter of 2018 Facebook had approximately 2.23 billion active users worldwide (Statistica). Mobile devices have become the dominant platform for Facebook usage - 68% of time spent on Facebook originates from mobile devices.

The effectiveness of a referral program depends, in part, on when a user is prompted to make a referral. If a user is prompted to make a referral right after an unhappy experience your chance of them making a referral is low because they don’t want to tell their friends about bad products. On the flip side, if a user is prompted right after a happy moment they are much more likely to make a referral even if the have previously had a bad experience.
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.