Referrals are when existing customers recommend a business to other people they know. It is one of the oldest and most trusted ways to grow, but it has a ceiling. You can only reach as many people as your current customers know, and that number is limited. Online marketing removes that ceiling by putting your business in front of people who have never heard of you before. A business that only grows through referrals is basically letting its customers control its growth rate. Do you think referral-based businesses are leaving too much opportunity on the table by avoiding online marketing?