Viral marketing produces content that people share spontaneously, spreading exponentially like a virus. Successful viral content triggers emotional responses: humor, surprise, awe, or social value.
The ALS Ice Bucket Challenge went globally viral, raising over $115 million. Old Spice's humorous commercials generated billions of views. These campaigns achieved massive reach with relatively small initial investments.
Viral marketing can be planned but never guaranteed. The key ingredients are emotional resonance, shareability, and timing. When it works, it delivers unprecedented ROI.