An anonymous reader writes "Plenty of corporations are willing to hire shills to generate buzz for a new product. But what people don't need to be paid to promote? Boston company BzzAgent found that their volunteers promote products simply because it makes them feel good. The NYT Magazine interviews several 'agents'. The volunteers cite the feeling of being 'on the inside', like sharing opinions with others, and enjoy feeling altruistic. Has Madison Avenue figured out what open source developers knew all along?"