When deciding whether to give you their business, prospective customers trust one source of information above all others: their peers. To sell more, you need to get your current customers marketing and selling — advocating — for you. First, find the core customers who are passionate about your company. One way to do this is by asking the “net promoter” question: “How likely are you to recommend us to a friend?” Then, for those who respond with “highly likely,” make it easy for them to do so right then. Give them the option to easily post a recommendation to their Facebook friends, LinkedIn connections, and Twitter followers. Try giving them the tools to write a product review on a site important to your market. Or make it simple for them to upload a video singing your praises.