Monetary or Non-Monetary Incentives – Choosing the reward for your referral program should not be approached simply. You need to understand what your users are motivated by and then offer prizes designed to reward that behavior. For example, they may be more interested in having access to premium features, getting company swag or even funny things like a dancing cat.
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The ad exchange puts the offer out for bid to demand-side platforms. Demand side platforms act on behalf of ad agencies, who sell ads which advertise brands. Demand side platforms thus have ads ready to display, and are searching for users to view them. Bidders get the information about the user ready to view the ad, and decide, based on that information, how much to offer to buy the ad space. According to the Internet Advertising Bureau, a demand side platform has 10 milliseconds to respond to an offer. The ad exchange picks the winning bid and informs both parties.
Search engine optimization, or SEO, attempts to improve a website's organic search rankings in SERPs by increasing the website content's relevance to search terms. Search engines regularly update their algorithms to penalize poor quality sites that try to game their rankings, making optimization a moving target for advertisers. Many vendors offer SEO services.:22
Incentives can range from discounts to cash incentives to store credits. It all depends on your product and what your customer is looking for. Your incentive should be appealing enough to make your customers want to share it with their friends. To get an idea of what you should offer, scope out your competition. If they’re offering $25 in credits, ensure you’re either matching the offer or providing a bit more. Remember that previously mentioned stat: companies with referral programs experience 86 percent more revenue growth when compared with the rest! So, provide as much as your budget allows.
ClickBank was established back in 1998, and this affiliate program primarily focuses on digital information products. It boats a network of over 1.5 million publishers, with an average of 50,000 transactions daily through affiliate sales. It is one of the few networks that offers recurring commissions from advertisers driven by a membership monetization model.
As advertisers collect data across multiple external websites about a user's online activity, they can create a detailed profile of the user's interests to deliver even more targeted advertising. This aggregation of data is called behavioral targeting. Advertisers can also target their audience by using contextual to deliver display ads related to the content of the web page where the ads appear.:118 Retargeting, behavioral targeting, and contextual advertising all are designed to increase an advertiser's return on investment, or ROI, over untargeted ads.
You brought some awesome examples. One of the best ways to get your campaign off the ground is by starting with the ideal audience. I find that I can use data to find my top customers and then make those into ambassadors, nurture those relationships, to create an epic viral campaign. Gilles de Clerck, founder of the Growth Revolution, talks about it here - https://sharesomefriends.com/blog/referral-marketing/
'The influencers in order to communicate marketing messages to the audiences you seek to reach'. In business, it is indicated that people prefer interaction with humans to a logo. Therefore, it seems that influencers are on behalf of a company to build up a relationship between the brand and their customers. Companies would be left behind if they neglected the trend of influencers in viral marketing, as over 60% of global brands have used influencers in marketing in 2016. The influencer types come along with the level of customers' involvement in companies' marketing. First, unintentional influences, because of brand satisfaction and low involvement, their action is just to deliver a company's message to a potential user. Secondly, users will become salesmen or promoters for a particular company with incentives. For example, ICQ offered their users benefits to create the awareness of their friends. Finally, the mass reached influencers are those who have a huge range of followers on the social network. Recent trend in businesses activity is to offer incentives to individual users for re-posting the advertisement messages to their own profiles. A common type of an incentive puts all the re-posting users into a random draw for a valuable gift 
Sixty-nine percent of online shoppers want more product reviews from ecommerce sites. When affiliates and influencers recommend your brand, it enhances your credibility almost instantly. After they promote you, make sure to share that information with your customers. Use images, icons, or text to publicize where your brand has been used and reviewed across the web.
^ Semenov, Alexander; Alexander Nikolaev; Alexander Veremyev; Vladimir Boginski; Eduardo Pasiliao (2016). Analysis of Viral Advertisement Re-Posting Activity in Social Media. Computational Social Networks. CSoNet 2016. Lecture Notes in Computer Science, Vol 9795. Lecture Notes in Computer Science. 9795. pp. 123–134. doi:10.1007/978-3-319-42345-6_11. ISBN 978-3-319-42344-9.