Monzo has grown its customer base over five times in one year and used different methods that help keep that base coming back; they ask for community feedback, open the company for equity crowdfunding rounds so users can invest and they host small, intimate events; 80 percent of their growth is word of mouth, the remaining 20 percent is through ads on Facebook and Twitter; “The biggest challenge is that we’re growing very fast — our customer and employee numbers are growing fast — we want to keep the customer focus, how we operate a transparent customer growth approach, and how we do that at scale,” as Tristan Thomas, Monzo’s head of marketing and community, tells TearSheet. Source.