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Politics and government are undergoing dramatic changes through the advent of new technology. The early developers of community networks (mentioned in Section 1.2) had hopeful visions of information technology (IT)-facilitating participatory democracy. Yet the most memorable visions have been literary dystopias, where surveillance is omnipresent and governments have absolute control. We shall begin by highlighting some of these important writings. We shall then consider a current and present topic—the cultural and legal frameworks governing free speech and other forms of expression on the internet. We review several kinds of ‘undesirable’ speech that test our commitment to free speech—messages that are viewed as obscene, hateful, seditious, or encouraging of terrorism. Next, we examine methods governments worldwide use to censor web content and prevent digital transmission of messages of which they disapprove, as well as a similar role for social media firms in what is now known as content moderation. We shall also mention one new form of rampant and very harmful internet speech— fake news. Fake news becomes especially troubling when it is released into and retransmitted widely into filter bubbles that select these messages and echo chambers that focus and sensationalize such points of view to the exclusion of other contradictory ideas. The prevalence and dangers of fake news became obvious during post facto analyses of the 2016 US presidential campaign. The internet and social media enable greater civic participation, which is usually called e-democracy or civic tech. Most such uses of social media are relatively benign, as in online deliberations about the desired size of a bond issue, or internet lobbying to get libraries to stay open longer during the summer. However, for more significant issues, such as violations of fundamental human rights, or unpopular political decisions that incite public unrest, social media communications may facilitate political protest that can lead to political change. IT also plays a role in elections—social media can be used to mobilize the electorate and build enthusiasm for a candidate. Correspondingly, surveys and big data are used to target potential voters during political campaigns and to tailor specific messages to key voters.

This chapter presents an overview of what is undoubtedly the most important of the many forms public discourse can take and to offer some insights into the distinctive field of knowledge about political communication that has developed over many years of academic analysis. Motivating this scholarly work has been the aim of developing a deeper understanding of how political power is distributed in society. The chapter maps the major concepts that structure this interdisciplinary field and focuses on pertinent issues that have piqued researchers’ curiosity about power and public communication. It asks ‘what is political communication’, maps the development of the discipline and outlines the issues that have arisen over the decades and, more latterly, in the internet age. It examines political communication as persuasion, as public discourse, as framing, as agenda setting, and examines the role of the internet in political engagement and e-campaigning.