The Vague Dots of Viral

Micro-level tactics: Seth Godin. "The Purple Cow".
Big-picture view: Malcolm Gladwell. "The Tipping Point".
Meta-Big-picture view: Steven Johnson. "Emergence".

Someone or I need to connect the above three dots into a unified whole. And that's where we tame the beast of viral marketing.

Identify and create a "purple cow" such that a lot of agents propagate or use the cow, thereby causing the "tipping point" and somehow the whole aggregate shows an "emergent" behavior.

Phew.