This video became a major hit because it directly addressed how phrases that are so commonly used can be detrimental to someone's self image and confidence. In the video, various men, women, and young boys are asked to "run like a girl" or "fight like a girl". Then young girls are asked to do the same, with a very different approach: They show strength and confidence in their movements.
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What happens if you have attrition in your customer base over time. An easy way to extend the model to take this into consideration would be to add a variable to model Attrition Rate as a percentage of the entire installed base at each cycle, and simply subract this from the total population at each cycle. This topic is nicely covered in this blog post by Andrew Chen: Is your website a leaky bucket? 4 scenarios for user retention.
The reason to make use or virality, the ease in spreading and sharing, is however a double-edged sword. We cannot forget that in this type of campaign, a large part of the control falls into the hands of the users, and we risk the message being misinterpreted or parodied. On the other hand, a successful viral campaign can work miracles for your brand’s results.