We’ve mentioned before, as have many others, that there is no such thing as a viral video. Hence, a client can’t legitimately request one in her brief to the agency.
Marketing guru Seth Godin endeavors to explain:
Word of mouth is a decaying function. A marketer does something and a consumer tells five or ten friends. And that’s it. It amplifies the marketing action and then fades, usually quickly. A lousy flight on United Airlines is word of mouth. A great meal at Momofuku is word of mouth.
Viral marketing is a compounding function. A marketer does something and then a consumer tells five or ten people. Then then they tell five or ten people. And it repeats. And grows and grows. Like a virus spreading through a population. The marketer doesn’t have to actually do anything else. (They can help by making it easier for the word to spread, but in the classic examples, the marketer is out of the loop.) The Mona Lisa is an ideavirus.