Virality at its core
Look, virality at its core is asking someone spend their social capital recommending or linking or posting about you for free. You’re saying: Post about me on Facebook. Tell your friends to watch my video. Invite your business contacts to use this service. The best way to get people to do this enormous favor for you? Make it seem like it isn’t a favor. Make it the kind of thing that is worth spreading and, of course, conducive to spreading.
No matter what your product is, you are ultimately in the education business. Your customers need to be constantly educated about the many advantages of doing business with you, trained to use your products more effectively, and taught how to make never-ending improvement in their lives.