Sick visual around how content is passed around - organic=dandelion, and then the spam marketing campaign (cancery clumps) #w2e
This intrigued me, as I had used Dandelion and Virus analogies talking about the social web 2 years ago and used these pictures:
Organic dandelion versus virus
And here's Paul Yiu's slide Betsy was looking at (number 8 in this deck):
Looks like a case of metaphors converging.