Owing to advances in communication technology, the human race now possesses more opportunities to interact with interpersonal partners than ever before. Particularly in recent decades, such technology has become increasingly faster, mobile, and powerful. Although tablets, smartphones, and social media are relatively new, the impetus behind their development is old, as throughout history humans have developed mechanisms for communicating ideas that transcend inherent temporal and spatial limitations of face-to-face communication. In the ancient past, humans developed writing and the alphabet to preserve knowledge across time, with the later development of the printing press further facilitating the mass distribution of written ideas. Later, the telegraph was arguably the first technology to separate communication from transportation, and the telephone enabled people at a distance to hear the warmth and intimacy of the human voice. The development of the Internet consolidates and advances these technologies by facilitating pictorial and video interactions, and the mobility provided by cell phones and other technologies makes the potential for communication with interpersonal partners nearly ubiquitous. As such, these technologies reconfigure perception of time and space, creating the sense of a smaller world where people can begin and manage interpersonal relationships across geographic distance. These developments in communication technology influence interpersonal processes in at least four ways. First, they introduce media choice as a salient question in interpersonal relationships. As recently as the late 20th century, people faced relatively few options for communicating with interpersonal partners; by the early years of the 21st century, people possessed a sometimes bewildering array of channel choices. Moreover, these choices matter because of the relational messages they send; for example, choosing to end a romantic relationship over the phone may communicate more sensitivity than choosing to do so via text messaging, or publicly on social media. Second, communication technology affords new opportunities to begin relationships and, through structural features of the media, shape how those meetings occur. The online dating industry generates over $1 billion in profit, with most Americans agreeing it is a good way to meet romantic partners; friendships also form online around shared interests and through connections on social media. Third, communication technology alters the practices people use to maintain interpersonal relationships. In addition to placing traditional forms of relational maintenance in more public spaces, social media facilitates passive browsing as a strategy for keeping up with interpersonal partners. Moreover, mobile technology affords partners increased geographic and temporal flexibility when keeping contact with partners, yet simultaneously, it may produce feelings of over-connectedness that hamper the desire for personal autonomy. Fourth, communication technology makes interpersonal networks more visibly manifest and preserves their continuity over time. This may provide an ongoing convoy of social support and, through increased efficiency, augment the size and diversity of social networks.