ViralEngagement is the most valuable but most elusive kind of engagement. I'm not sure that we have a good example of ViralEngagement on AboutUs yet so I'll tell a hypothetical story in order to illustrate Viral Engagement. We roll out the InfluenceUs wizard widely and now people begin to use it to write messages to other people. The new people then write messages to other new people. The number of people writing InfluenceUs messages grows without us having to ask people to write them.