"Viral" is like sex. (Gettig laid.) It's something which is very desirable, so much so that the target of the marketing/proposal often wonders if the virality is the actual point of the interaction as opposed to real utility. There are so many parallels that come to mind, I wonder if there is a general game-theoretic dynamic at work?
One parallel: it's better to be casual about being viral. It's not good to seem over-anxious.
One parallel: it's better to be casual about being viral. It's not good to seem over-anxious.