Chobani uses Twitter to champion a culture of yogurt fanatics, serving up recipes that incorporate Greek yogurt in unexpected ways, such as a lighter salad dressing or richer macaroni and cheese. Consumers who tweet about eating Chobani get an enthusiastic reply asking what flavor they got and “What’dya think?!”, while those who tweet their dissatisfaction with a new flavor are offered coupons. —Olivia B. Waxman