When many global mutual funds and life insurance companies came to India they tied up with banks to promote business. When banks with a tradition of providing good service endorse an investment product it is more likely to be accepted by the customers. Aviva launched their life insurance products through Canara Bank before going out on their own and thus got a good customer base to work on.
The ALS Ice Bucket Challenge started in 2014, which was an online effort to raise awareness for people with Amyotrophic Lateral Sclerosis (ALS) disease and to raise funds. The campaign was able to raise $115 million in a span of just eight weeks! The challenge for people was to pour a bucket of ice-cold water over their head and challenge minimum three people to do the same and make a donation to The ALS Association.
In the case of viral marketing, "viral" refers to something that spreads quickly and widely across its audience. Viral marketing is a deliberate enterprise, though the distribution of a message happens organically. As such, social media provides the perfect ecosystem for viral marketing, though it has its roots in traditional word-of-mouth marketing. While the practice was much more widely used in the early to mid-2000s, as new internet businesses were being created in extreme numbers, it is still common among internet-based business-to-consumer (B-to-C) companies. The widespread adoption of social networks, including YouTube, Twitter, Instagram, Snapchat and Facebook, has enabled modern viral marketing efforts and increased their efficacy. 
You may use both cash or non-cash incentives for referral marketing example, but a Chicago University study found that non-monetary incentives were more effective than cash benefits by 24%. It is also better to not confine referral to customers or employees alone, referral marketing websites can also be used to new customers and lure them into referral marketing programs.
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