In the advertising world, you’ve probably heard a lot about “return on investment.” How much money you spend on a campaign, and what that expenditure gets you, determines ROI. In other words, your return is how much value your ads bring to your business. Advertising is expensive and tricky....

Many people join Facebook Dating hoping to meet someone interesting, only to find that weeks pass with very few matches. The experience can feel confusing. After all, you may already be active on Facebook, have good photos, and consider yourself approachable. Yet the matches simply do not come. This situation...