 In the 21st century, new media technologies for social networking such as Facebook, Twitter, WhatsApp and YouTube began to transform the social, political and informational practices of individuals and institutions across the globe, inviting philosophical responses from the community of applied ethicists and philosophers of technology. While scholarly responses to social media continue to be challenged by the rapidly evolving nature of these technologies, the urgent need for attention to the social networking phenomenon is underscored by the fact that it has profoundly reshaped how many human beings initiate and/or maintain virtually every type of ethically significant social bond or role: friend-to-friend, parent-to-child, co-worker-to co-worker, employer-to-employee, teacher-to-student, neighbor-to-neighbor, seller-to-buyer, doctor-to-patient, and voter-to-voter, to offer just a partial list. Nor are the ethical implications of these technologies strictly interpersonal, as it has become evident that social networking services (hereafter referred to as SNS) and other new digital media have profound implications for democracy, public institutions and the rule of law. The complex web of interactions between SNS developers and users, and their online and offline communities, corporations and governments—along with the diverse and sometimes conflicting motives and interests of these various stakeholders—will continue to require rigorous ethical analysis for decades to come.