Growth Hacking and Viral Marketing
Growth hacking is a philosophy of rapid experimentation across marketing channels and product features to drive accelerated growth with limited resources. Viral marketing creates content, mechanisms, or incentives that cause users to spread a product or message to others — achieving growth with marginal cost per new user. Both approaches prioritise scalable, often unconventional tactics over traditional marketing spend.
Growth Hacking Principles
- Product-led growth: embed growth mechanisms into the product itself — Dropbox's referral programme, Hotmail's email footer, LinkedIn's "connect with Gmail contacts"
- Experiment velocity: run many small, fast experiments — optimise conversion at every step of the funnel
- Data-driven iteration: measure everything; kill what doesn't work quickly, scale what does
- Cross-functional approach: growth teams typically span marketing, product, engineering, and data
Viral Marketing Mechanics
Viral coefficient (K): if each user refers K new users, K > 1 means exponential growth; K < 1 means eventual decline. Creating viral loops: provide a compelling reason to share (benefit to sharer and recipient); reduce friction in sharing; make sharing visible to the recipient network. Examples: Airbnb's Craigslist integration, Uber's referral credits, Cash App's payment sharing.