Viral Marketing
Content MarketingAlso: Virality · Viral Content · Word of Mouth Marketing
Quick definition
Viral marketing is growth driven by existing users sharing content or inviting new users. A viral coefficient above 1 means each user generates more than one new user — producing exponential growth without proportional spend.
Where it shows up in the data
What it actually means
Viral marketing in its technical sense means growth where each user generates more than one additional user — the viral coefficient K is above 1. At K = 1.1, a starting base of 1,000 users becomes 10,000 without any additional acquisition spend, as each cycle of sharing creates more users who then share again. In practice, truly viral products are rare. Most consumer apps have K values between 0.1 and 0.5, meaning existing users do contribute to growth but it's incremental rather than exponential. In common usage, 'going viral' refers to any content that spreads far beyond its original audience — this doesn't require K > 1, just a single piece of content that gets shared disproportionately relative to normal output.
Viral isn't a distribution strategy you add to a product. It's usually a property the product either has or doesn't.
The Australian context
Australian consumer apps in fintech, health and marketplace categories have benefited from referral-driven virality, particularly where the product is used in social contexts (group payments, shared savings goals, team fitness apps). The consumer market is small enough that true viral loops can spread quickly through social networks before hitting saturation.
Related terms
Common questions
About New Rebellion
New Rebellion is a marketing intelligence consultancy. We build tools, score Australian businesses on how their marketing actually performs, and publish Debrief every day. This dictionary is part of how we work in the open.
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