Start thinking of your users as members of your community.
In this section we're going to look at your user flow and sales funnel and pin point the most natural time to ask them to tell others about your application or service. You want to make it seamless and catch them at their most euphoric/engaged moment and make it seamless with the workings of your product/service.
While you want to keep everything focused on your audience, make sure there's always an opportunity for people to talk about you.