Viral Growth
A growth phenomenon where existing users drive new user acquisition through organic sharing and referrals.
Definition
Viral growth occurs when users naturally share a product or service with others, leading to exponential user acquisition without significant marketing spend. The product spreads organically through word-of-mouth, social sharing, or built-in referral mechanisms.
Key Characteristics
Organic Sharing: Users voluntarily share with their network
Exponential Growth: User base grows rapidly without proportional marketing costs
Network Effects: Product value increases as more users join
Low CAC: Customer acquisition cost decreases as virality increases
Self-Sustaining: Growth continues with minimal intervention
Real-World Example
Dropbox: Offered extra storage space for both referrer and referee when users invited friends. This drove 35% of daily sign-ups through referrals.
WhatsApp: Required friends to join for group messaging, creating natural viral loops as users invited contacts to communicate.