Advertisers spent the better part of the 20th century trying to control and measure and
manipulate the spread of information—to count the number of eyes and ears that they could reach with a single message. But this notion says that the most successful ideas are those that spread and grow because of the customer’s relationship to other customers—not the marketer’s to the customer. This PDF outlines how ideas spread in an age of invasive marketing on steroids and disengagement.